Implementing Evidence-Based Practice in Community Mental Health Agencies: A Multiple Stakeholder Analysis
Open accessAbstract
Objectives. We sought to identify factors believed to facilitate or hinder evidence-based practice (EBP) implementation in public mental health service systems as a step in developing theory to be tested in future studies. Methods. Focusing across levels of an entire large public sector mental health service system for youths, we engaged participants from 6 stakeholder groups: county officials, agency directors, program managers, clinical staff, administrative staff, and consumers. Results. Participants generated 105 unique statements identifying implementation barriers and facilitators. Participants rated each statement on importance and changeability (i.e., the degree to which each barrier or facilitator is considered changeable). Data analyses distilled statements into 14 factors or dimensions. Descriptive analyses suggest that perceptions of importance and changeability varied across stakeholder groups. Conclusions. Implementation of EBP is a complex process. Cross-system–level approaches are needed to bring divergent and convergent perspectives to light. Examples include agency and program directors facilitating EBP implementation by supporting staff, actively sharing information with policymakers and administrators about EBP effectiveness and fit with clients' needs and preferences, and helping clinicians to present and deliver EBPs and address consumer concerns.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Aarons, Wells, Zagursky, Fettes, & Palinkas (2009) found among multiple stakeholders implementing EBPs in community mental health agencies that funding was endorsed as both the most important and least changeable factor in implementation success.
“Likewise, Aarons, Wells, Zagursky, Fettes, & Palinkas (2009) found among multiple stakeholders implementing EBPs in community mental health agencies that funding was endorsed as both the most important and least changeable factor in implementation success.”
From Evidence-Based Mental Health Programs in Schools: Barriers and Facilitators of Successful Implementation (2010) · cites this paper as Aarons, Wells, Zagursky, Fettes, & Palinkas (2009)
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
Evidence based medicine: what it is and what it isn't
Sackett, D. L., Rosenberg, W. M. C., Gray, J. A. M., Haynes, R. B., & Richardson, W. S. (1996) · BMJ · doi:10.1136/bmj.312.7023.71 · Cited by 15,769 · see citing works
Leading change: why transformation efforts fail
Kotter, J. P. (2009) · IEEE Engineering Management Review · doi:10.1109/emr.2009.5235501 · Cited by 4,513 · see citing works
(2005) · Cited by 3,748 · see citing works
Crossing the Quality Chasm: A New Health System for the 21st Century
Bloom, B. S. (2002) · JAMA · doi:10.1001/jama.287.5.646-a · Cited by 3,732 · see citing works
Evidence-based practice in psychology.
American Psychological Association (2006) · American Psychologist · doi:10.1037/0003-066x.61.4.271 · Cited by 2,478 · see citing works
The Challenge of Innovation Implementation
Klein, K. J., & Sorra, J. S. (1996) · The Academy of Management Review · doi:10.2307/259164 · Cited by 2,113 · see citing works
The Meaning of Translational Research and Why It Matters
Woolf, S. H. (2008) · JAMA · doi:10.1001/jama.2007.26 · Cited by 1,910 · see citing works
An introduction to concept mapping for planning and evaluation
Trochim, W. M. K. (1989) · Evaluation and Program Planning · doi:10.1016/0149-7189(89)90016-5 · Cited by 1,512 · see citing works
Managing Clinical Knowledge for Health Care Improvement
Balas, E. A., & Boren, S. A. (2000) · Yearbook of Medical Informatics · doi:10.1055/s-0038-1637943 · Cited by 1,479 · see citing works
Ferlie, E. B., & Shortell, S. M. (2001) · The Milbank Quarterly · doi:10.1111/1468-0009.00206 · Cited by 1,335 · see citing works
Frambach, R. T., & Schillewaert, N. (2002) · Journal of Business Research · doi:10.1016/s0148-2963(00)00152-1 · Cited by 1,270 · see citing works
Concept Mapping for Planning and Evaluation
Kane, M., & Trochim, W. M. K. (2006) · Sage eBooks · doi:10.4135/9781412983730 · Cited by 1,141 · see citing works
How Can We Increase Translation of Research into Practice? Types of Evidence Needed
Glasgow, R. E., & Emmons, K. M. (2007) · Annual Review of Public Health · doi:10.1146/annurev.publhealth.28.021406.144145 · Cited by 1,050 · see citing works
Health policy-makers' perceptions of their use of evidence: a systematic review
Innvær, S., Vist, G., Trommald, M., & Oxman, A. (2002) · Journal of Health Services Research & Policy · doi:10.1258/135581902320432778 · Cited by 1,006 · see citing works
Clinical Research to Clinical Practice — Lost in Translation?
Lenfant, C. J. M. (2003) · New England Journal of Medicine · doi:10.1056/nejmsa035507 · Cited by 898 · see citing works
Varvasovszky, Z. (2000) · Health Policy and Planning · doi:10.1093/heapol/15.3.338 · Cited by 733 · see citing works
Kazdin, A. E., Siegel, T., & Bass, D. C. (1992) · Journal of Consulting and Clinical Psychology · doi:10.1037//0022-006x.60.5.733 · Cited by 652 · see citing works
Implementing computerized technology: An organizational analysis.
Klein, K. J., Conn, A. B., & Sorra, J. S. (2001) · Journal of Applied Psychology · doi:10.1037/0021-9010.86.5.811 · Cited by 615 · see citing works
Evidence-Based Practice in Child and Adolescent Mental Health Services
Hoagwood, K., Burns, B. J., Kiser, L., Ringeisen, H., & Schoenwald, S. K. (2001) · Psychiatric Services · doi:10.1176/appi.ps.52.9.1179 · Cited by 607 · see citing works
Pathways to “Evidence-Informed” Policy and Practice: A Framework for Action
Bowen, S., & Zwi, A. B. (2005) · PLoS Medicine · doi:10.1371/journal.pmed.0020166 · Cited by 541 · see citing works
A conceptual framework for transferring research to practice
Simpson, D. D. (2002) · Journal of Substance Abuse Treatment · doi:10.1016/s0740-5472(02)00231-3 · Cited by 538 · see citing works
Aarons, G. A. (2006) · Psychiatric Services · doi:10.1176/appi.ps.57.8.1162 · Cited by 525 · see citing works
Self-citationBarriers and bridges to evidence based clinical practice
Haynes, B. R., & Haines, A. (1998) · BMJ · doi:10.1136/bmj.317.7153.273 · Cited by 522 · see citing works
Kazdin, A. E., Siegel, T., & Bass, D. C. (1992) · Journal of Consulting and Clinical Psychology · doi:10.1037/0022-006x.60.5.733 · Cited by 488 · see citing works
No going back: A review of the literature on sustaining organizational change
Buchanan, D., Fitzgerald, L., Ketley, D., Gollop, R., Jones, J. L., Lamont, S. S., Neath, A., & Whitby, E. (2005) · International Journal of Management Reviews · doi:10.1111/j.1468-2370.2005.00111.x · Cited by 475 · see citing works
Implementation of Evidence-based Practice in Child Welfare: Service Provider Perspectives
Aarons, G. A., & Palinkas, L. A. (2007) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-007-0121-3 · Cited by 450 · see citing works
Self-citationBrownson, R. C., Royer, C., Ewing, R., & McBride, T. D. (2006) · American Journal of Preventive Medicine · doi:10.1016/j.amepre.2005.10.004 · Cited by 439 · see citing works
An introduction to concept mapping as a participatory public health research method
Burke, J. G., O’Campo, P., Peak, G. L., Gielen, A. C., McDonnell, K. A., & Trochim, W. M. K. (2005) · Qualitative Health Research · doi:10.1177/1049732305278876 · Cited by 437 · see citing works
Alexander, J. F., & Robbins, M. S. (2018) · Springer eBooks · doi:10.1007/978-3-319-15877-8_161-1 · Cited by 415 · see citing works
Assessing country-level efforts to link research to action
Lavis, J. N. (2006) · Bulletin of the World Health Organization · doi:10.2471/blt.06.030312 · Cited by 399 · see citing works
Can scientists and policy makers work together?: Table 1
Choi, B. C. K., Pang, T., Lin, V., Puska, P., Sherman, G., Goddard, M., Ackland, M. J., Sainsbury, P., Stachenko, S., Morrison, H., et al. (2005) · Journal of Epidemiology & Community Health · doi:10.1136/jech.2004.031765 · Cited by 395 · see citing works
Aggression Replacement Training: A Comprehensive Intervention for Aggressive Youth
(2003) · PsycEXTRA Dataset · doi:10.1037/e596762007-001 · Cited by 375 · see citing works
The Organizational Context of Children's Mental Health Services
Glisson, C. A. (2002) · Clinical Child and Family Psychology Review · doi:10.1023/a:1020972906177 · Cited by 366 · see citing works
Aarons, G. A., & Sawitzky, A. C. (2006) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-006-0039-1 · Cited by 346 · see citing works
Self-citationAchieving health gain through clinical guidelines II: Ensuring guidelines change medical practice.
Grimshaw, J., & Russell, I. T. (1994) · BMJ Quality & Safety · doi:10.1136/qshc.3.1.45 · Cited by 328 · see citing works
The Method of Sorting as a Data-Gathering Procedure in Multivariate Research.
Rosenberg, S., & Kim, M. P. (1975) · Multivariate Behavioral Research · doi:10.1207/s15327906mbr1004_7 · Cited by 314 · see citing works
Aarons, G. A., Sommerfeld, D. H., Hecht, D. B., Silovsky, J. F., & Chaffin, M. J. (2009) · Journal of Consulting and Clinical Psychology · doi:10.1037/a0013223 · Cited by 297 · see citing works
Self-citationAarons, G. A. (2005) · Child and Adolescent Psychiatric Clinics of North America · doi:10.1016/j.chc.2004.04.008 · Cited by 296 · see citing works
Self-citationReport of the 2005 Presidential Task Force on Evidence-Based Practice
(2005) · PsycEXTRA Dataset · doi:10.1037/e582372010-001 · Cited by 230 · see citing works
The Corruption of Managerial Techniques by Organizations
Lozeau, D., Langley, A., & Denis, J. (2002) · Human Relations · doi:10.1177/0018726702055005427 · Cited by 203 · see citing works
Reviewing the behavioral science knowledge base on technology transfer. Introduction.
Backer, T. E., David, S. L., & Soucy, G. (1995) · PubMed · Cited by 173 · see citing works
The NIMH Blueprint for Change Report: Research Priorities in Child and Adolescent Mental Health
Hoagwood, K., & Olin, S.-C. S. (2002) · Journal of the American Academy of Child & Adolescent Psychiatry · doi:10.1097/00004583-200207000-00006 · Cited by 173 · see citing works
Closing the gap between research and practice
Geddes, J. R., & Harrison, P. J. (1997) · The British Journal of Psychiatry · doi:10.1192/bjp.171.3.220 · Cited by 171 · see citing works
Taket, A. R. (1992) · Cited by 163 · see citing works
The State Policy Context of Implementation Issues for Evidence-Based Practices in Mental Health
Isett, K. R., Burnam, M. A., Coleman-Beattie, B., Hyde, P. S., MORRISSEY, J. P., Magnabosco, J. L., Rapp, C. A., Ganju, V. K., & Goldman, H. H. (2007) · Psychiatric Services · doi:10.1176/ps.2007.58.7.914 · Cited by 146 · see citing works
Evidence-Based Medicine and the Implementation Gap
Dopson, S., Locock, L., Gabbay, J., Ferlie, E. B., & Fitzgerald, L. (2003) · Health An Interdisciplinary Journal for the Social Study of Health Illness and Medicine · doi:10.1177/1363459303007003004 · Cited by 143 · see citing works
Trochim, W. M. K., Milstein, B., Wood, B. J., Jackson, S., & Pressler, V. (2004) · Health Promotion Practice · doi:10.1177/1524839903258020 · Cited by 105 · see citing works
Cost Shifting to Jails after a Change to Managed Mental Health Care
Domino, M. E., Norton, E. C., Morrissey, J. P., & Thakur, N. (2004) · Health Services Research · doi:10.1111/j.1475-6773.2004.00295.x · Cited by 99 · see citing works
The role of the middle manager in the implementation of evidence-based health care
Dopson, S., & Fitzgerald, L. (2005) · Journal of Nursing Management · doi:10.1111/j.1365-2934.2005.00612.x · Cited by 88 · see citing works
Development of a model of the tobacco industry’s interference with tobacco control programmes
Trochim, W. M. K., Stillman, F. A., Clark, P. I., & Schmitt, C. L. (2003) · Tobacco Control · doi:10.1136/tc.12.2.140 · Cited by 72 · see citing works
Denis, J., Lehoux, P., Hivon, M., et al. (2003) · Journal of Health Services Research & Policy · doi:10.1258/135581903322405162 · Cited by 62 · see citing works
Taket, A. R., Pettigrew, A., Ferlie, E. B., et al. (1994) · Journal of the Operational Research Society · doi:10.2307/2584400 · Cited by 59 · see citing works
Effective Technology Transfer in Alcoholism Treatment
Morgenstern, J. (2000) · Substance Use & Misuse · doi:10.3109/10826080009148236 · Cited by 55 · see citing works
Strategies for implementing evidence-based practices in routine mental health settings
Drake, R. E., Torrey, W. C., & McHugo, G. J. (2003) · Evidence-Based Mental Health · doi:10.1136/ebmh.6.1.6 · Cited by 42 · see citing works
Palinkas, L. A., & Aarons, G. A. (2009) · International journal of child health and human development · Cited by 40 · see citing works
Self-citationAarons, G. A., Goldman, M. S., Greenbaum, P. E., & Coovert, M. D. (2003) · Addictive Behaviors · doi:10.1016/s0306-4603(01)00282-9 · Cited by 37 · see citing works
Self-citationAligning Measurement-based Quality Improvement with Implementation of Evidence-based Practices
Hermann, R. C., Chan, J., Zazzali, J. L., & Lerner, D. (2006) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-006-0055-1 · Cited by 32 · see citing works
Exploring evidence-policy linkages in health research plans: A case study from six countries
Syed, S. B., Hyder, A. A., Bloom, G., Sundaram, S., Bhuiya, A., Zhenzhong, Z., Kanjilal, B., Oladepo, O., Pariyo, G. W., Peters, D. H., et al. (2008) · Health Research Policy and Systems · doi:10.1186/1478-4505-6-4 · Cited by 25 · see citing works
Reviewing the Behavioral Science Knowledge Base on Technology Transfer: NIDA Research Monograph 155
Backer, T. E., David, S. L., & Saucy, G. (1995) · PsycEXTRA Dataset · doi:10.1037/e495742006-001 · Cited by 25 · see citing works
SUSTAINING CONTINUOUS IMPROVEMENT: WHAT ARE THE KEY ISSUES?
Dale, B. G., Boaden, R., Wilcox, M., et al. (1999) · Quality Engineering · doi:10.1080/08982119908919253 · Cited by 18 · see citing works
Program Notes: Health Education in Practice
Lancaster, B. (1992) · Health Education Quarterly · doi:10.1177/109019819201900310 · Cited by 12 · see citing works
Knowledge to Action: Evidence-Based Health Care in Context - Dopson, S. and Fitzgerald, L.
Allen, D. A. (2006) · Sociology of Health & Illness · doi:10.1111/j.1467-9566.2006.00503_1.x · Cited by 5 · see citing works
Flagged first, then by citations
Research works printed but not linked: 5
- [25]Choi BC, Pang T, Lin V, et al. Can scientists and policy makers work together? J Epidemiol Community Health 2005;59:632–637 [DOI] [PMC free article] [PubMed] [Google Scholar]
- [31]Rimmer M, Macneil J, Chenhall R, Langfield-Smith K, Watts L. Reinventing Competitiveness: Achieving Best Practice in Australia. South Melbourne, Australia: Pitman; 1996 [Google Scholar]
- [40]Dunham RB, Grube JA, Gardner DG, Pierce JL. The development of an attitude toward change instrument. Presented at the 49th Annual Meeting of the Academy of Management; August 1989; Washington, DC [Google Scholar]
- [56]Davison ML. Multidimensional Scaling. New York, NY: John Wiley & Sons Inc; 1983 [Google Scholar]
- [64]Aarons GA, Sommerfeld DH. Transformational leadership, team climate for innovation, and staff attitudes toward adopting evidence-based practice. Presented as a talk at the 68th Annual Meeting of the Academy of Management; August 2008; Anaheim, CA [Google Scholar]
Cited by
Sorted by citations
Palinkas, L. A., Horwitz, S. M., Green, C. A., Wisdom, J. P., Duan, N., & Hoagwood, K. (2015) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-013-0528-y · Cited by 12,038 · see citing works
“Two of the six studies used maximum variation sampling in a sequential design (Aarons et al. 2009; Zazzali et al. 2008) and one in a simultaneous design (Henke et al. 2008) for the purpose of development, and three used it in a simultaneous design for complementarity (Bachman et al. 2009; Henke et…”
MethodSelf-citationAdvancing a Conceptual Model of Evidence-Based Practice Implementation in Public Service Sectors
Aarons, G. A., Hurlburt, M., & Horwitz, S. M. (2011) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-010-0327-7 · Cited by 3,240 · see citing works
“Whether an EBP is part of new services, being integrated into existing services, or replacing existing funded services, fiscal resource availability is critical (Aarons et al. 2009).”
BackgroundInfluentialSelf-citationMixed method designs in implementation research
Palinkas, L. A., Aarons, G. A., Horwitz, S., Chamberlain, P., Hurlburt, M., & Landsverk, J. (2011) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-010-0314-z · Cited by 1,187 · see citing works
Self-citationMethods to Improve the Selection and Tailoring of Implementation Strategies
Powell, B. J., Beidas, R. S., Lewis, C. C., Aarons, G. A., McMillen, J. C., Proctor, E. K., & Mandell, D. S. (2017) · The Journal of Behavioral Health Services & Research · doi:10.1007/s11414-015-9475-6 · Cited by 967 · see citing works
Self-citationEhrhart, M. G., Aarons, G. A., & Farahnak, L. R. (2014) · Implementation Science · doi:10.1186/s13012-014-0157-1 · Cited by 502 · see citing works
Self-citationLangley, A. K., Nadeem, E., Kataoka, S. H., Stein, B. D., & Jaycox, L. H. (2010) · School Mental Health · doi:10.1007/s12310-010-9038-1 · Cited by 477 · see citing works
Innovation Adoption: A Review of Theories and Constructs
Wisdom, J. P., Chor, K. H. B., Hoagwood, K. E., & Horwitz, S. M. (2014) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-013-0486-4 · Cited by 451 · see citing works
Novins, D. K., Green, A. E., Legha, R. K., & Aarons, G. A. (2013) · Journal of the American Academy of Child & Adolescent Psychiatry · doi:10.1016/j.jaac.2013.07.012 · Cited by 270 · see citing works
Self-citationGreen, C. A., Duan, N., Gibbons, R. D., Hoagwood, K. E., Palinkas, L. A., & Wisdom, J. P. (2015) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-014-0552-6 · Cited by 205 · see citing works
Self-citationA pragmatic method for costing implementation strategies using time-driven activity-based costing
Cidav, Z., Mandell, D., Pyne, J., Beidas, R., Curran, G., & Marcus, S. (2020) · Implementation Science · doi:10.1186/s13012-020-00993-1 · Cited by 174 · see citing works
Powell, B. J., Stanick, C. F., Halko, H. M., Dorsey, C. N., Weiner, B. J., Barwick, M. A., Damschroder, L. J., Wensing, M., Wolfenden, L., & Lewis, C. C. (2017) · Implementation Science · doi:10.1186/s13012-017-0649-x · Cited by 144 · see citing works
Interagency collaborative team model for capacity building to scale-up evidence-based practice
Hurlburt, M., Aarons, G. A., Fettes, D., Willging, C., Gunderson, L., & Chaffin, M. J. (2014) · Children and Youth Services Review · doi:10.1016/j.childyouth.2013.10.005 · Cited by 132 · see citing works
Self-citationMitchell, P. F. (2011) · Children and Youth Services Review · doi:10.1016/j.childyouth.2010.10.003 · Cited by 126 · see citing works
Measures for Predictors of Innovation Adoption
Chor, K. H. B., Wisdom, J. P., Olin, S.-C. S., Hoagwood, K. E., & Horwitz, S. M. (2015) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-014-0551-7 · Cited by 85 · see citing works
Costs to Community Mental Health Agencies to Sustain an Evidence-Based Practice
Roundfield, K. D., & Lang, J. M. (2017) · Psychiatric Services · doi:10.1176/appi.ps.201600193 · Cited by 60 · see citing works
Measuring Costs to Community-Based Agencies for Implementation of an Evidence-Based Practice
Lang, J. M., & Connell, C. M. (2017) · The Journal of Behavioral Health Services & Research · doi:10.1007/s11414-016-9541-8 · Cited by 41 · see citing works
Motamedi, M., Lau, A. S., Lind, T., Lui, J. H., Rodriguez, A., Smith, A., & Brookman-Frazee, L. (2021) · Implementation Research and Practice · doi:10.1177/2633489520982903 · Cited by 17 · see citing works
Hogue, A., Dauber, S., Bobek, M., Jensen-Doss, A., & Henderson, C. E. (2019) · Implementation Science · doi:10.1186/s13012-019-0874-6 · Cited by 11 · see citing works
- Authors
- Aarons, G. A., Wells, R. S., Zagursky, K., Fettes, D. L., & Palinkas, L. A.
- Affiliations
- University of North Carolina at Chapel Hill (US)
- Venue
- American Journal of Public Health
- Publisher
- American Public Health Association
- Published
- 2009-11
- Volume
- 99
- Issue
- 11
- Pages
- 2087-2095
- ISSN
- 0090-0036 (ISSN-L)
- 1541-0048
- PMC
- PMC2759812
- OpenAlex
- W1965434963
- Cited by
- 299
- References
- 62
- Citations by year
- 2026: 7 · 2025: 8 · 2024: 12 · 2023: 7 · 2022: 16 · 2021: 29 · 2020: 32 · 2019: 28 · 2018: 20 · 2017: 20 · 2016: 18 · 2015: 27 · 2014: 22 · 2013: 18 · 2012: 14
- FWCI
- 21.18
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- American Journal of Public Health (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Mental Health (R03MH070703, R01MH072961)
- Topics
- Health Sciences › Health Professions › General Health Professions › Health Policy Implementation Science
- Health Sciences › Health Professions › General Health Professions › Health Sciences Research and Education
- Social Sciences › Psychology › Clinical Psychology › Psychiatric care and mental health services
- Keywords
- evidence-based practice, implementation barriers and facilitators, community mental health services, youth mental health, stakeholder perspectives, county officials, agency directors, program managers, clinical staff, office workers, consumers, implementation theory
- MeSH terms
- Adolescent, California, Community Mental Health Services, Community-Institutional Relations, Community Participation, Female, Humans, Male, Organizational Case Studies, Evidence-Based Practice
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review