The DOI matches its Crossref record; 30 of the 31 references it cites were found in a registry or an index.
Feedback-informed treatment versus usual psychological treatment for depression and anxiety: a multisite, open-label, cluster randomised controlled trial
Open accessAbstract
Background Previous research suggests that the use of outcome feedback technology can enable psychological therapists to identify and resolve obstacles to clinical improvement. We aimed to assess the effectiveness of an outcome feedback quality assurance system applied in stepped care psychological services.Methods This multisite, open-label, cluster randomised controlled trial was done at eight National Health Service (NHS) Trusts in England, involving therapists who were qualified to deliver evidence-based low-intensity or high-intensity psychological interventions. Adult patients (18 years or older) who accessed individual therapy with participating therapists were eligible for inclusion, except patients who accessed group therapies and those who attended less than two individual therapy sessions. Therapists were randomly assigned (1:1) to an outcome feedback intervention group or a treatment-as-usual control group by use of a computer-generated randomisation algorithm. The allocation of patients to therapists was quasi-random, whereby patients on waiting lists were allocated sequentially on the basis of therapist availability. All patients received low-intensity (less than eight sessions) or high-intensity (up to 20 sessions) psychological therapies for the duration of the 1-year study period. An automated computer algorithm alerted therapists in the outcome feedback group to patients who were not on track, and primed them to review these patients in clinical supervision. The primary outcome was symptom severity on validated depression (Patient Health Questionnaire-9 [PHQ-9]) and anxiety (Generalised Anxiety Disorder-7 [GAD-7]) measures after treatment of varying durations, which were compared between groups with multilevel modelling, controlling for cluster (therapist) effects. We used an intention-to-treat approach. This trial was prospectively registered with ISRCTN, number ISRCTN12459454.Findings In total, 79 therapists were recruited to the study between Jan 8, 2016, and July 15, 2016, but two did not participate. Of these participants, 39 (51%) were randomly assigned to the outcome feedback group and 38 (49%) to the control group. Overall, 2233 patients were included in the trial (1176 [53%] were treated by therapists in the outcome feedback group, and 1057 [47%] by therapists in the control group). Patients classified as not on track had less severe symptoms after treatment if they were allocated to the outcome feedback group than those in the control group (PHQ-9 d=0·23, B=-1·03 [95% CI -1·84 to -0·23], p=0·012; GAD-7 d=0·19, B=-0·85 [-1·56 to -0·14], p=0·019).Interpretation Supplementing psychological therapy with low-cost feedback technology can reduce symptom severity in patients at risk of poor response to treatment. This evidence supports the implementation of outcome feedback in stepped care psychological services.Funding English NHS and Department of Health Sciences, University of York, York, UK.
Overview
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
Verification
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?
The source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Beyond CF, it has been shown that practising data-informed psychotherapy with technological augmentation tools (i.e., CDSS, ROM and feedback systems, CSTs) contributes to better treatment outcomes (Cohen et al., 2021;de Jong et al., 2021;Delgadillo et al., 2018).”
From Data-Informed Case Formulation with the Trier Treatment Navigator (2022) · cites this paper as Delgadillo et al., 2018
Experimental — accuracy not yet measuredIn the citing paper
“Because providing continuous feedback to patients has been shown to be a valuable therapeutic procedure [29], we also included studies that adopted EMA-based feedback as a therapeutic tool for clinically depressed patients.”
From Current state and future directions of technology-based ecological momentary assessment and intervention for major depressive disorder: a systematic review (2019) · cites this paper as [29]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
The PHQ-9: Validity of a brief depression severity measure
Kroenke, K., Spitzer, R. L., & Williams, J. B. W. (2001) · Journal of General Internal Medicine · doi:10.1046/j.1525-1497.2001.016009606.x · Cited by 44,910
Anxiety disorders in primary care: prevalence, impairment, comorbidity, and detection
Kroenke, K., Spitzer, R. L., Williams, J. B. W., Monahan, P. O., & Löwe, B. (2007) · Annals of Internal Medicine · doi:10.7326/0003-4819-146-5-200703060-00004 · Cited by 4,741
Bergin and Garfield's Handbook of Psychotherapy and Behavior Change
Lambert, M. J. (2003) · Cited by 3,383
The Work and Social Adjustment Scale: a simple measure of impairment in functioning
Mundt, J. C., Marks, I. M., Shear, M. K., & Greist, J. M. (2002) · British Journal of Psychiatry · doi:10.1192/bjp.180.5.461 · Cited by 2,515
Multiple Imputation for Multivariate Missing-Data Problems: A Data Analyst's Perspective
Schafer, J. L., & Olsen, M. K. (1998) · Multivariate Behavioral Research · doi:10.1207/s15327906mbr3304_5 · Cited by 1,518
The psychotherapy dose-response effect and its implications for treatment delivery services.
Hansen, N. B., Lambert, M. J., & Forman, E. M. (2002) · Clinical Psychology: Science and Practice · doi:10.1093/clipsy.9.3.329 · Cited by 783
Clark, D. M. (2011) · International Review of Psychiatry · doi:10.3109/09540261.2011.606803 · Cited by 699
Shimokawa, K., Lambert, M. J., & Smart, D. W. (2010) · Journal of Consulting and Clinical Psychology · doi:10.1037/a0019247 · Cited by 657
Routine outcome monitoring and feedback on physical or mental health status: evidence and theory
Carlier, I. V. E., Meuldijk, D., van Vliet, I. M., van Fenema, E. M., van der Wee, N. J. A., & Zitman, F. G. (2010) · Journal of Evaluation in Clinical Practice · doi:10.1111/j.1365-2753.2010.01543.x · Cited by 288
Effect of feedback of treatment outcome in specialist mental healthcare: meta-analysis
Knaup, C., Koesters, M., Schöfer, D., Becker, T. M., & Puschner, B. (2009) · The British Journal of Psychiatry · doi:10.1192/bjp.bp.108.053967 · Cited by 281
Cited by
Sorted by citations
Items 101–153 of 153
Roach, A., Stokes, I., McDonnell, K., Griffiths, H. R., Curry, V., Heyman, I., Balakrishnan, S., Ndoci, X., Bennett, S. D., & Shafran, R. (2024) · Behavioural and Cognitive Psychotherapy · doi:10.1017/s1352465824000390 · Cited by 3
“Using outcome measures has been shown to improve patient outcomes and described as ‘ essential ’ to implementing evidence-based practice (Boswell, 2015); session-by-session feedback is also strongly supported by empirical data from adult research (Delgadillo et al ., 2018).”
Systematic Client Feedback: A naturalistic pilot study
Gimeno-Peón, A., Prado-Abril, J., Inchausti, F., Barrio-Nespereira, A., Álvarez-Casariego, M. T., & Duncan, B. L. (2019) · Ansiedad y Estrés · doi:10.1016/j.anyes.2019.04.005 · Cited by 3
Fast Track Treatment for Puberphonia
Muthiah, K. (2020) · Scholarly Journal of Otolaryngology · doi:10.32474/sjo.2020.03.000173 · Cited by 3
Generation of fundamental soliton in the presence of initial linear chirp
Kaczmarek, T. (2004) · Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu · Cited by 3
Zhu, X., Yin, X., Jiang, S., Wang, M., & Cheng, J. (2025) · BMJ Open · doi:10.1136/bmjopen-2025-100123 · Cited by 2
“Such changes may reflect the evolving nature of conditions like AF and the impact of clinical interventions or treatment modalities.”
Stuit, F., Engelsbel, F., Boenink, A. D., Barneveld-Oudt, L., Beekman, A. T. F., & Metz, M. J. (2025) · Community Mental Health Journal · doi:10.1007/s10597-025-01535-z · Cited by 2
Ngabo-Woods, H., Dunai, L., & Verdú, I. S. (2025) · Applied Sciences · doi:10.3390/app152312524 · Cited by 2
Einfluss von Verlaufsfeedback auf die Behandlungseffektivität ambulanter Psychotherapien
Schöttke, H., Unrath, M., & Uhlmann, C. (2019) · Verhaltenstherapie · doi:10.1159/000501176 · Cited by 2
“Auf psychometrischen Daten beruhende Feedbacksysteme wurden bereits stationär und ambulant eingesetzt [Berking et al., 2006; De Jong et al., 2014; Delgadillo et al., 2018; Hawkins et al., 2004; Lambert et al., 2001; Lambert et al., 2002; Strauß et al., 2015; Whipple et al., 2003].”
BackgroundInfluentialPersonalización en Psicoterapia: Estado Actual y Desafíos para su Implementación en Latinoamérica
Manubens, R. T., Buongiorno, E., & Penedo, J. M. G. (2024) · Revista de Psicoterapia · doi:10.5944/rdp.v35i127.39808 · Cited by 2
Davey, E., Bryant‐Waugh, R., Bennett, S. D., Micali, N., Baudinet, J., Konstantellou, A., Clark-Stone, S., Green, A., & Shafran, R. (2025) · European Eating Disorders Review · doi:10.1002/erv.3171 · Cited by 2
Simmonds‐Buckley, M., Kellett, S., Hague, J., & Waller, G. (2025) · The Cognitive Behaviour Therapist · doi:10.1017/s1754470x24000412 · Cited by 2
“Implementation intentions are acceptable to patients (Lucock et al ., 2018) and have been shown to double the rate of activation-related goal attainment during the treatment of depression (Fritzsche et al ., 2016).”
Machine learning and child and adolescent mental health services: challenges and opportunities
Tiffin, P. A., & Paton, L. W. (2022) · Elsevier eBooks · doi:10.1016/b978-0-323-91709-4.00003-2 · Cited by 2
Lutz, W., Clausen, S. A., Bennemann, B., Zimmermann, D., Prinz, J. N., Rubel, J. A., & Deisenhofer, A. (2019) · Verhaltenstherapie · doi:10.1159/000501026 · Cited by 2
“Trotz der “Einfachheit” des psychometrischen Feedbacks als therapeutische Unterstützung ergeben sich bereits moderate Effektstärken [Delgadillo et al., 2018; Kendrick et al., 2016; Lambert et al., 2018].”
BackgroundSelf-citationChoice, voice and collaboration: using preference accommodation and feedback in trauma therapy
Mahon, D. (2021) · Mental Health and Social Inclusion · doi:10.1108/mhsi-06-2021-0032 · Cited by 3
Outcome feedback technology helps therapists to tailor care
Glazebrook, C., & Davies, E. B. (2018) · The Lancet Psychiatry · doi:10.1016/s2215-0366(18)30212-8 · Cited by 2
Ramsperger, S., Witthöft, M., & Bräscher, A. (2024) · Psychotherapy Research · doi:10.1080/10503307.2024.2334047 · Cited by 1
“…during the course of treat-ment by more than the upper boundary of the two-tailed 50%, 68%, 80%, 90% or 95% failure boundary (see Bone et al., 2021; Delgadillo et al., 2018; Finch et al., 2001; Lutz et al., 1999, 2019), patients were considered at risk for negative treatment outcome and labeled as…”
Bhaskarapillai, B., Malo, P. K., Kishore, M. T., Joseph, A., Majhi, G., Jaisoorya, T. S., & Thennarasu, K. (2024) · Indian Journal of Psychological Medicine · doi:10.1177/02537176241293194 · Cited by 1
“34, 35 ( Figure 3 ).”
InfluentialKrakowczyk, J. B., Teufel, M., Skoda, E., Jansen, C., Lalgi, T. J., Martens, L., Dinger, U., Lutz, W., & Bäuerle, A. (2025) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-025-01455-w · Cited by 2
“Routine Outcome Monitoring (ROM) has gained prominence in mental health care (Carlier & Eeden, 2017; de Jong et al., 2012; Delgadillo et al., 2018).”
Self-citationDemir, S., Brakemeier, E.-L., & Kaiser, T. (2025) · Cognitive Therapy and Research · doi:10.1007/s10608-025-10663-5 · Cited by 1
Ämmälä, A., & TAIMELA, S. P. (2025) · Journal of Affective Disorders · doi:10.1016/j.jad.2025.120541 · Cited by 1
Die NVL Depression benötigt mutigere und differenziertere Aussagen zur Psychotherapie
Rief, W., Brakemeier, E., Kaiser, T., Kircher, T. T. J., Lieb, K., Margraf, J., Michalak, J., Reif, A., Schneider, S., & Voderholzer, U. (2022) · Der Nervenarzt · doi:10.1007/s00115-022-01351-w · Cited by 1
Hisler, G. C., Young, K. S., Cumpanasoiu, D. C., Palacios, J. E., Duffy, D. J., Enrique, Á., Keegan, D., & Richards, D. (2024) · Counselling and Psychotherapy Research · doi:10.1002/capr.12771 · Cited by 1
Zhang, T., Buckman, J. E. J., Suh, J. W., Stott, J. C. H., Singh, S., Jena, R., Naqvi, S. A., Pilling, S., Cape, J. D., & Saunders, R. (2024) · Journal of Affective Disorders · doi:10.1016/j.jad.2024.08.027 · Cited by 1
Clausen, S. A., & Lutz, W. (2019) · PPmP - Psychotherapie · Psychosomatik · Medizinische Psychologie · doi:10.1055/a-0752-0914 · Cited by 1
Self-citationColombo, D. (2020) · Tesis Doctorals en Xarxa (Consorci de Serveis Universitaris de Catalunya) · doi:10.6035/14109.2020.762821 · Cited by 1
Predicting undesired treatment outcome in mental healthcare: Machine learning studyPreprint
van Mens, K., Lokkerbol, J., Janssen, R. T. J. M., Lange, R., & Tiemens, B. G. (2021) · Research portal (Tilburg University) · doi:10.2196/preprints.17235
Cost-effectiveness of feedback-informed psychological treatment: Evidence from the IAPT-FIT trial
Delgadillo, J., McMillan, D., Gilbody, S. M., Jong, K. D., Lucock, M. P., Lutz, W., Rubel, J. A., Aguirre, E., & Ali, S. (2021) · PsycEXTRA Dataset · doi:10.1037/e506602022-001 · Cited by 2
Self-citationKendrick, T., Dowrick, C. F., Lewis, G., Moore, M. V., Leydon, G., Geraghty, A. W. A., Griffiths, G. O., Zhu, S., Yao, G., May, C. R., et al. (2023) · SSRN Electronic Journal · doi:10.2139/ssrn.4522402 · Cited by 1
Evidenzbasierte-personalisierte Psychotherapie: psychometrisches Feedback in der Praxis
Deisenhofer, A., Boyle, K. S., & Lutz, W. (2019) · PiD - Psychotherapie im Dialog · doi:10.1055/a-0771-7901
“[9] Delgadillo J, de Jong K, Lucock M et al.”
BackgroundSelf-citationIntroduction to the Special Series on Practice-Based Research
Persons, J. B., & Codd, R. T. (2020) · Behavior Therapy · doi:10.1016/j.beth.2020.09.005
The Cognitive Behavioral Therapy in Later Life
Steffen, A. M., & Schmidt, N. E. (2021) · Elsevier eBooks · doi:10.1016/b978-0-12-818697-8.00106-0
Rakowska, J. M. (2021) · Wydawnictwa Uniwersytetu Warszawskiego eBooks · doi:10.31338/uw.9788323547655
Providing Choice and Preferences to Service Users Accessing Trauma Treatment: A Multicultural Lens
Mahon, D. (2022) · Emerald Group Publishing Limited eBooks · doi:10.1108/978-1-80382-429-120221008 · Cited by 1
Richardson, E., Hogan, T. P., Shimada, S. L., Sliwinski, S. K., & Kim, B. (2022) · BMJ Open · doi:10.1136/bmjopen-2022-064450
Milot, M. (2022) · Journal of Workplace Behavioral Health · doi:10.1080/15555240.2022.2142132
“…BTAS-5 was also developed for use as part of feedback-informed treatment (FIT) approaches which elicit feedback from clients between sessions to provide information to therapists to adjust treatment (Miller, Hubble, Chow, & Seidel, 2015) in ways that can improve outcomes (Delgadillo et al., 2018).”
BackgroundColli, C. D., Viglione, A., Poggini, S., Cirulli, F., Chiarotti, F., Giuliani, A., & Branchi, I. (2024) · SSRN Electronic Journal · doi:10.2139/ssrn.4792347
Riopel, G., Lecomte, T., Merlo, R., Gauthier, B., Grenier, S., & Vanasse, C. (2024) · Counselling and Psychotherapy Research · doi:10.1002/capr.12804
A Scoping Review on Client-Focused Feedback System in Psychotherapy: Routine Outcome Monitoring
ÖZTÜRK, İ., & Yorulmaz, O. (2024) · Psikiyatride Guncel Yaklasimlar - Current Approaches in Psychiatry · doi:10.18863/pgy.1414793
“A randomized controlled trial conducted by Delgadillo et al. (2018) involved 77 psychotherapists in the UK who were qualified to deliver evidence-based psychological interventions.”
BackgroundFeedback in the Treatment of Suicidality
Page, A. C., Kyron, M. J., & Hooke, G. R. (2025) · CBT: science into practice · doi:10.1007/978-3-031-90428-8_9
Clinical Support Tools for Treatment Adaptation in Non-improving Cases
Delgadillo, J., de Jong, K., & Barkham, M. (2025) · CBT: science into practice · doi:10.1007/978-3-031-90428-8_6
Self-citationDelgadillo, J., Barkham, M., & Lucock, M. P. (2026) · The Cognitive Behaviour Therapist · doi:10.1017/s1754470x25100445
“The international collaborations are evidenced in co-authorship of studies including research partners in Germany (e.g. Delgadillo et al ., 2018) and the USA (e.g. Delgadillo et al ., 2022).”
InfluentialSelf-citationBhaskarapillai, B., Malo, P. K., Kishore, M. T., Joseph, A., Majhi, G., Jaisoorya, T. S., & Thennarasu, K. (2026) · Indian Journal of Psychiatry · doi:10.4103/indianjpsychiatry_915_25
Practice-Based Evidence as a Cornerstone for Learning Health Systems
Barkham, M., Saxon, D. R., Firth, N., & Delgadillo, J. (2026) · Oxford University Press eBooks · doi:10.1093/9780197748336.003.0002
Self-citationAI-Assisted Precision Psychotherapy: Toward a Process-Based Framework of Therapeutic Interaction
Mendlovic, S. (2026) · Psychiatry International · doi:10.3390/psychiatryint7030124
“Research has shown that such feedback systems may, under certain conditions, help identify patients at risk of deterioration or dropout and may improve treatment outcomes by enabling therapists to adjust their interventions accordingly [29,30].”
Persons, J. B., Zieve, G. G., & Kreit, G. P. (2026) · Behavior Therapy · doi:10.1016/j.beth.2026.07.003
NILSSON, M. H. L., Rydberg, M., Clausen-Ekefjärd, J., & Westling, S. (2026) · BMJ Open Quality · doi:10.1136/bmjoq-2026-004233
Telman, L. G. E., Marić, M., Bögels, S. M., & van Steensel, F. J. A. (2026) · Behavioural and Cognitive Psychotherapy · doi:10.1017/s1352465826101416
“Most studies used CBT (Delgadillo et al ., 2018; Knaup et al ., 2009) or other forms of psychotherapy (Knaup et al ., 2009; Whipple et al ., 2003).”
The SMD = .17 verdict—Comparative hypotheses, comparative trials and the real world
Flückiger, C., Barkham, M., & Penedo, J. M. G. (2026) · Psychotherapy Research · doi:10.1080/10503307.2026.2732020
Grey, G., Shafran, R., Brem, C., Hata, A., Pilling, S., Lewis, G., Krebs, G., Saunders, R., & Buckman, J. E. J. (2026) · Journal of Affective Disorders · doi:10.1016/j.jad.2026.122608
Jensen‐Doss, A., McLeod, B. D., Casline, E. P., Langer, D. A., & Douglas, S. R. (2026) · Journal of Clinical Child & Adolescent Psychology · doi:10.1080/15374416.2026.2745076
The construction and validation of the Rula wellbeing scale
Coleman, J. J., Park, J., Davis, J., Owen, J., Tanega, C., Woodhouse, A., Newton, D., & Seiniger, S. (2026) · Frontiers in Psychology · doi:10.3389/fpsyg.2026.1876391
“Therapists who are responsive to their MBC feedback show reduced rates of deterioration and superior outcomes compared to those who do not (Delgadillo et al., 2018; Lambert et al., 2018).”
Gibbons, M. B. C., Gallop, R., Allen, N. B., Liow, Y., Kodkany, N., & Crits-Christoph, P. F. (2026) · Administration and Policy in Mental Health and Mental Health Services Research · doi:10.1007/s10488-026-01532-8
Metadata
- Authors
- Delgadillo, J., de Jong, K., Lucock, M., Lutz, W., Rubel, J., Gilbody, S., Ali, S., Aguirre, E., Appleton, M., Nevin, J., O'Hayon, H., Patel, U., Sainty, A., Spencer, P., & McMillan, D.
- Affiliations
- University of Sheffield (GB)
- University of Huddersfield (GB)
- Universität Trier (DE)
- University of York (GB)
- National Health Service (GB)
- Pennine Care NHS Foundation Trust (GB)
- Cheshire and Wirral Partnership NHS Foundation Trust (GB)
- Whittington Health NHS Trust (GB)
- Cambridgeshire and Peterborough NHS Foundation Trust (GB)
- Humber Teaching NHS Foundation Trust (GB)
- South West Yorkshire Partnership NHS Foundation Trust (GB)
- Corresponding author
- Delgadillo, Jaime
- ORCID
- Venue
- The Lancet Psychiatry
- Publisher
- Elsevier BV
- Published
- 2018-07
- Volume
- 5
- Issue
- 7
- Pages
- 564-572
- ISSN
- 2215-0366 (ISSN-L)
- OpenAlex
- W2809000673
- Cited by
- 152
- References
- 31
- Citations by year
- 2026: 13 · 2025: 15 · 2024: 28 · 2023: 13 · 2022: 19 · 2021: 21 · 2020: 19 · 2019: 20 · 2018: 3
- FWCI
- 18.76
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The Lancet Psychiatry (publishedVersion)
- PubMed (publishedVersion)
- Huddersfield Research Portal (University of Huddersfield) (publishedVersion, cc-by-nc-nd)
- White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
- Leiden Repository (Leiden University) (submittedVersion)
- White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- Topics
- Social Sciences › Psychology › Clinical Psychology › Psychotherapy Techniques and Applications
- Social Sciences › Psychology › Applied Psychology › Digital Mental Health Interventions
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
- Keywords
- outcome feedback, feedback-informed treatment, depression, anxiety, stepped care, psychotherapy, clinical supervision, low-intensity psychological interventions, symptom severity, treatment progress monitoring, automated alerts, individual psychotherapy, waiting lists, NHS mental health services, intention-to-treat analysis
- MeSH terms
- Adult, Anxiety Disorders, Cost-Benefit Analysis, Depressive Disorder, England, Feedback, Female, Humans, Male, Middle Aged, Psychotherapy, Quality of Life, State Medicine, Treatment Outcome, 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