The DOI matches its Crossref record; 66 of the 66 references it cites were found in a registry or an index.
The Effectiveness and Risks of Long-Term Opioid Therapy for Chronic Pain: A Systematic Review for a National Institutes of Health Pathways to Prevention Workshop
Abstract
BACKGROUND: Increases in prescriptions of opioid medications for chronic pain have been accompanied by increases in opioid overdoses, abuse, and other harms and uncertainty about long-term effectiveness. PURPOSE: To evaluate evidence on the effectiveness and harms of long-term (>3 months) opioid therapy for chronic pain in adults. DATA SOURCES: MEDLINE, the Cochrane Central Register of Controlled Trials, the Cochrane Database of Systematic Reviews, PsycINFO, and CINAHL (January 2008 through August 2014); relevant studies from a prior review; reference lists; and ClinicalTrials.gov. STUDY SELECTION: Randomized trials and observational studies that involved adults with chronic pain who were prescribed long-term opioid therapy and that evaluated opioid therapy versus placebo, no opioid, or nonopioid therapy; different opioid dosing strategies; or risk mitigation strategies. DATA EXTRACTION: Dual extraction and quality assessment. DATA SYNTHESIS: No study of opioid therapy versus no opioid therapy evaluated long-term (>1 year) outcomes related to pain, function, quality of life, opioid abuse, or addiction. Good- and fair-quality observational studies suggest that opioid therapy for chronic pain is associated with increased risk for overdose, opioid abuse, fractures, myocardial infarction, and markers of sexual dysfunction, although there are few studies for each of these outcomes; for some harms, higher doses are associated with increased risk. Evidence on the effectiveness and harms of different opioid dosing and risk mitigation strategies is limited. LIMITATIONS: Non-English-language articles were excluded, meta-analysis could not be done, and publication bias could not be assessed. No placebo-controlled trials met inclusion criteria, evidence was lacking for many comparisons and outcomes, and observational studies were limited in their ability to address potential confounding. CONCLUSION: Evidence is insufficient to determine the effectiveness of long-term opioid therapy for improving chronic pain and function. Evidence supports a dose-dependent risk for serious harms. PRIMARY FUNDING SOURCE: Agency for Healthcare Research and Quality.
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
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?
In the citing paper
“This finding is relevant given that there is a growing body of evidence to suggest that prescribed opioid medication misuse is alarmingly frequent in chronic pain patients [35,36,37,38].”
In the citing paper
“Moreover, medications such as opioids carry increased risks, including adverse side effects, opioid-induced hyperalgesia, abuse, and overdose [11–13].”
From Feasibility and Acceptability of an Abbreviated, Four-Week Mindfulness Program for Chronic Pain Management. (2020) · cites this paper as [11]
Citations
Cites
QUADAS-2: a revised tool for the quality assessment of diagnostic accuracy studies
Whiting, P. F., Rutjes, A. W. S., Westwood, M. E., Mallett, S., Deeks, J. J., Reitsma, J. B., Leeflang, M. M. G., Sterne, J. A. C., Bossuyt, P. M. M., & the QUADAS-2 Group* (2011) · Annals of Internal Medicine · doi:10.7326/0003-4819-155-8-201110180-00009 · Cited by 14,199
RELIEVING PAIN IN AMERICA: A BLUEPRINT FOR TRANSFORMING PREVENTION, CARE, EDUCATION, AND RESEARCH
Simon, L. S. (2012) · Journal of Pain & Palliative Care Pharmacotherapy · doi:10.3109/15360288.2012.678473 · Cited by 2,199
Clinical Guidelines for the Use of Chronic Opioid Therapy in Chronic Noncancer Pain
Chou, R., Fanciullo, G. J., Fine, P. G., Adler, J. A., Ballantyne, J. C., Davies, P., Donovan, M. I., Fishbain, D. A., Foley, K. M., Fudin, J., et al. (2009) · The Journal of Pain · doi:10.1016/j.jpain.2008.10.008 · Cited by 2,192
Self-citation2009 updated method guidelines for systematic reviews in the Cochrane Back Review Group
Furlan, A. D., Pennick, V., Bombardier, C., & van Tulder, M. (2009) · Spine · doi:10.1097/brs.0b013e3181b1c99f · Cited by 1,663
Association Between Opioid Prescribing Patterns and Opioid Overdose-Related Deaths
Bohnert, A. S. B. (2011) · JAMA · doi:10.1001/jama.2011.370 · Cited by 1,509
DIAGNOSTIC AND STATISTICAL MANUAL OF MENTAL DISORDERS, FIFTH EDITION
Abbas, A., & Aminoroaia, M. (2013) · Cited by 1,478
Opioid Prescriptions for Chronic Pain and Overdose
Dunn, K. M., Saunders, K. W., Rutter, C. M., Banta‐Green, C. J., Merrill, J. O., Sullivan, M. D., Weisner, C. M., Silverberg, M. J., Campbell, C. I., Psaty, B. M., et al. (2010) · Annals of Internal Medicine · doi:10.7326/0003-4819-152-2-201001190-00006 · Cited by 1,265
Webster, L. R., & Webster, R. M. (2005) · Pain Medicine · doi:10.1111/j.1526-4637.2005.00072.x · Cited by 1,096
Users' Guides to the Medical Literature
McGinn, T. G., Guyatt, G., Wyer, P. C., Naylor, C. D., Stiell, I. G., Richardson, W. S., & for the Evidence-Based Medicine Working Group (2000) · JAMA · doi:10.1001/jama.284.1.79 · Cited by 1,009
Opioids for chronic noncancer pain: A meta-analysis of effectiveness and side effects
Furlan, A. D. (2006) · Canadian Medical Association Journal · doi:10.1503/cmaj.051528 · Cited by 873
Long-term opioid management for chronic noncancer pain
Noble, M., Treadwell, J. R., Tregear, S., Coates, V. H., Wiffen, P. J., Akafomo, C., Schoelles, K. M., & Chou, R. (2010) · Cochrane Database of Systematic Reviews · doi:10.1002/14651858.cd006605.pub2 · Cited by 748
Self-citationOpioid Dose and Drug-Related Mortality in Patients With Nonmalignant Pain
Gomes, T., Mamdani, M., Dhalla, I. A., Paterson, J. M., & Juurlink, D. N. (2011) · Archives of Internal Medicine · doi:10.1001/archinternmed.2011.117 · Cited by 637
Trends in long‐term opioid therapy for chronic non‐cancer pain
Boudreau, D. M., Korff, M. V., Rutter, C. M., Saunders, K. W., Ray, G. T., Sullivan, M. D., Campbell, C. I., Merrill, J. O., Silverberg, M. J., Banta‐Green, C. J., et al. (2009) · Pharmacoepidemiology and Drug Safety · doi:10.1002/pds.1833 · Cited by 522
Seal, K. H., Shi, Y., Cohen, G., Cohen, B. E., Maguen, S., Krebs, E. E., & Neylan, T. C. (2012) · JAMA · doi:10.1001/jama.2012.234 · Cited by 515
Edlund, M. J., Martin, B. C., Russo, J. E., DEVRIES, A. R., Braden, J. B., & Sullivan, M. D. (2013) · Clinical Journal of Pain · doi:10.1097/ajp.0000000000000021 · Cited by 512
Drug poisoning deaths in the United States, 1980-2008.
Warner, M., Chen, L. H., Makuc, D. M., Anderson, R. N., & Miniño, A. (2011) · PubMed · Cited by 399
Sullivan, M. D., Edlund, M. J., Fan, M.-Y., DEVRIES, A. R., Braden, J. B., & Martin, B. C. (2008) · Pain · doi:10.1016/j.pain.2008.04.027 · Cited by 377
Boscarino, J. A., Rukstalis, M. R., Hoffman, S. N., Han, J., Erlich, P. M., Gerhard, G. S., & Stewart, W. F. (2010) · Addiction · doi:10.1111/j.1360-0443.2010.03052.x · Cited by 367
Use of opioid medications for chronic noncancer pain syndromes in primary care
Reid, M. C., Engles-Horton, L., Weber, M. B., Kerns, R. D., Rogers, E., & O’Connor, P. G. (2002) · Journal of General Internal Medicine · doi:10.1046/j.1525-1497.2002.10435.x · Cited by 336
Starrels, J. L., Becker, W. C., Alford, D. P., Kapoor, A., Williams, A. R., & Turner, B. J. (2010) · Annals of Internal Medicine · doi:10.7326/0003-4819-152-11-201006010-00004 · Cited by 306
Opioid Therapy for Chronic Noncancer Back Pain
Jamison, R. N., Raymond, S. A., Slawsby, E. A., Nedeljković, S. S., & Katz, N. P. (1998) · Spine · doi:10.1097/00007632-199812010-00014 · Cited by 301
Substance Use Disorders in a Primary Care Sample Receiving Daily Opioid Therapy
Fleming, M. F., Balousek, S. L., Klessig, C. L., Mundt, M. P., & Brown, D. D. (2007) · The Journal of Pain · doi:10.1016/j.jpain.2007.02.432 · Cited by 274
Relationship of Opioid Use and Dosage Levels to Fractures in Older Chronic Pain Patients
Saunders, K. W., Dunn, K. M., Merrill, J. O., Sullivan, M. D., Weisner, C. M., Braden, J. B., Psaty, B. M., & Korff, M. V. (2010) · Journal of General Internal Medicine · doi:10.1007/s11606-009-1218-z · Cited by 271
Chou, R., Cruciani, R. A., Fiellin, D. A., Compton, P. A., Farrar, J. T., Haigney, M. C., Inturrisi, C. E., Knight, J. R., Otis‐Green, S., Marcus, S. M., et al. (2014) · Journal of Pain · doi:10.1016/j.jpain.2014.01.494 · Cited by 263
Self-citationOpioid Prescriptions by U.S. Primary Care Physicians From 1992 to 2001
Olsen, Y. K., Daumit, G. L., & Ford, D. E. (2006) · Journal of Pain · doi:10.1016/j.jpain.2005.11.006 · Cited by 230
A history of being prescribed controlled substances and risk of drug overdose death
Paulozzi, L. J., Kilbourne, E. M., Shah, N. G., Nolte, K. B., Desai, H. A., Landen, M. G., Harvey, W., & Loring, L. D. (2012) · Pain Medicine · doi:10.1111/j.1526-4637.2011.01260.x · Cited by 221
Curtailing Diversion and Abuse of Opioid Analgesics Without Jeopardizing Pain Treatment
Volkow, N. D. (2011) · JAMA · doi:10.1001/jama.2011.369 · Cited by 213
Long-term Use of Controlled-release Oxycodone for Noncancer Pain: Results of a 3-year Registry Study
Portenoy, R. K., Farrar, J. T., Bačkonja, M.-M., Cleeland, C. S., Yang, K., Friedman, M., Colucci, S. V., & Richards, P. T. (2007) · Clinical Journal of Pain · doi:10.1097/ajp.0b013e31802b582f · Cited by 200
Opioids for Back Pain Patients: Primary Care Prescribing Patterns and Use of Services
Deyo, R. A., Smith, D. H., Johnson, E. S., Donovan, M. I., Tillotson, C. J., Yang, X. Y., Petrik, A. F., & Dobscha, S. K. (2011) · The Journal of the American Board of Family Medicine · doi:10.3122/jabfm.2011.06.100232 · Cited by 183
Self-citationAkbik, H., Butler, S., Budman, S., Fernandez, K., Katz, N., & Jamison, R. (2006) · Journal of Pain and Symptom Management · doi:10.1016/j.jpainsymman.2006.03.010 · Cited by 181
Wild, J. E., Grond, S., Kuperwasser, B., Gilbert, J. S., McCann, B., Lange, B., Steup, A., Häufel, T., Etropolski, M. S., Rauschkolb, C., et al. (2010) · Pain Practice · doi:10.1111/j.1533-2500.2010.00397.x · Cited by 176
Franklin, G. M., Mai, J., Turner, J. A., Sullivan, M. D., Wickizer, T. M., & Fulton‐Kehoe, D. (2011) · American Journal of Industrial Medicine · doi:10.1002/ajim.21998 · Cited by 173
Self-citationRolita, L., Spegman, A. M., Tang, X., & Cronstein, B. N. (2013) · Journal of the American Geriatrics Society · doi:10.1111/jgs.12148 · Cited by 167
Allan, L. G., Richarz, U., Simpson, K. H., & Slappendel, R. (2005) · Spine · doi:10.1097/01.brs.0000186860.23078.a8 · Cited by 163
Opioid use for noncancer pain and risk of myocardial infarction amongst adults
Li, L., Setoguchi, S., Cabral, H., & Jick, S. S. (2013) · Journal of Internal Medicine · doi:10.1111/joim.12035 · Cited by 157
Moore, T. M., Jones, T., Browder, J. H., Daffron, S., & Passik, S. D. (2009) · Pain Medicine · doi:10.1111/j.1526-4637.2009.00743.x · Cited by 152
Carman, W. J., Su, S., Cook, S. F., Wurzelmann, J. I., & McAfee, A. T. (2011) · Pharmacoepidemiology and Drug Safety · doi:10.1002/pds.2131 · Cited by 149
Opioid Dose and Risk of Road Trauma in Canada
Gomes, T., Redelmeier, D. A., Juurlink, D. N., Dhalla, I. A., Camacho, X., & Mamdani, M. (2013) · JAMA Internal Medicine · doi:10.1001/2013.jamainternmed.733 · Cited by 145
Opioid use behaviors, mental health and pain—Development of a typology of chronic pain patients
Banta‐Green, C. J., Merrill, J. O., Doyle, S. R., Boudreau, D. M., & Calsyn, D. A. (2009) · Drug and Alcohol Dependence · doi:10.1016/j.drugalcdep.2009.03.021 · Cited by 137
Effects of Opioids on Driving Ability
Galski, T., Williams, J. B. W., & Ehle, H. T. (2000) · Journal of Pain and Symptom Management · doi:10.1016/s0885-3924(99)00158-x · Cited by 127
Furlan, A. D., Chaparro, L. E., Irvin, E., & Mailis, A. (2011) · Pain Research and Management · doi:10.1155/2011/465281 · Cited by 126
Starrels, J. L., Becker, W. C., Weiner, M. G., Li, X., Heo, M., & Turner, B. J. (2011) · Journal of General Internal Medicine · doi:10.1007/s11606-011-1648-2 · Cited by 123
The Effect of Opioids on Driving and Psychomotor Performance in Patients With Chronic Pain
Byas‐Smith, M. G., Chapman, S. L., Reed, B. A., & Cotsonis, G. (2005) · Clinical Journal of Pain · doi:10.1097/01.ajp.0000125244.29279.c1 · Cited by 116
A Survey of Chronic Noncancer Pain Patients Prescribed Opioid Analgesics
Cowan, D. T., Wilson‐Barnett, J., Griffiths, P., & Allan, L. G. (2003) · Pain Medicine · doi:10.1111/j.1526-4637.2003.03038.x · Cited by 110
Compton, P. A., Wu, S. M., Schieffer, B. M., Phạm, Q., & Naliboff, B. D. (2008) · Journal of Pain and Symptom Management · doi:10.1016/j.jpainsymman.2007.11.006 · Cited by 109
Does report of craving opioid medication predict aberrant drug behavior among chronic pain patients
Wasan, A. D., Butler, S. F., Budman, S. H., Fernandez, K., Weiss, R. D., Greenfield, S. F., & Jamison, R. N. (2009) · The Clinical Journal of Pain · doi:10.1097/ajp.0b013e318193a6c4 · Cited by 109
Salzman, R. T., Roberts, M. S., Wild, J. E., Fabian, C. J., Reder, R. F., & Goldenheim, P. D. (1999) · Journal of Pain and Symptom Management · doi:10.1016/s0885-3924(99)00079-2 · Cited by 108
Classification and identification of opioid addiction in chronic pain patients
Højsted, J., Nielsen, P. R., KENDALL, S., FRICH, L., & Sjøgren, P. (2010) · European Journal of Pain · doi:10.1016/j.ejpain.2010.04.006 · Cited by 102
Li, L., Setoguchi, S., Cabral, H., & Jick, S. S. (2013) · American Journal of Epidemiology · doi:10.1093/aje/kwt013 · Cited by 101
Driving Ability Under Long-Term Treatment with Transdermal Fentanyl
Sabatowski, R., Schwalen, S., Rettig, K., Herberg, K. W., Sm, K., & Radbruch, L. (2003) · Journal of Pain and Symptom Management · doi:10.1016/s0885-3924(02)00539-0 · Cited by 93
Menefee, L. A., Frank, E. D., Crerand, C. E., Jalali, S., Park, J., Sanschagrin, K., & Besser, M. (2004) · Pain Medicine · doi:10.1111/j.1526-4637.2004.04005.x · Cited by 75
A Comparison of Various Risk Screening Methods in Predicting Discharge From Opioid Treatment
Jones, T., Moore, T., Levy, J. L., Daffron, S., Browder, J. H., Allen, L., & Passik, S. D. (2011) · Clinical Journal of Pain · doi:10.1097/ajp.0b013e318225da9e · Cited by 72
Ralphs, J. A., de C Williams, A. C., Richardson, P. H., Pither, C. E., & Nicholas, M. K. (1994) · Pain · doi:10.1016/0304-3959(94)90166-x · Cited by 70
A Randomized Trial of 2 Prescription Strategies for Opioid Treatment of Chronic Nonmalignant Pain
Naliboff, B. D., Wu, S. M., Schieffer, B. M., Bolus, R. R., Phạm, Q., Baria, A., Aragaki, D. R., Vort, W. B. V., Davis, F., & Shekelle, P. (2010) · Journal of Pain · doi:10.1016/j.jpain.2010.09.003 · Cited by 64
Rates of Adverse Events of Long-Acting Opioids in a State Medicaid Program
Hartung, D. M., Middleton, L., Haxby, D. G., Koder, M., Ketchum, K. L., & Chou, R. (2007) · Annals of Pharmacotherapy · doi:10.1345/aph.1k066 · Cited by 64
Self-citationSchneider, J. P., & Kirsh, K. L. (2011) · Journal of Opioid Management · doi:10.5055/jom.2010.0036 · Cited by 58
Outpatient Treatment of Prescription Opioid Dependence: Comparison of Two Methods
Tennant, F. S. (1982) · Archives of Internal Medicine · doi:10.1001/archinte.1982.00340230087016 · Cited by 53
Addiction Severity Index in a chronic pain sample receiving opioid therapy
Saffier, K., Colombo, C., Brown, D., Mundt, M. P., & Fleming, M. F. (2007) · Journal of Substance Abuse Treatment · doi:10.1016/j.jsat.2006.12.011 · Cited by 52
Prescription Opioids for Back Pain and Use of Medications for Erectile Dysfunction
Deyo, R. A., Smith, D. H., Johnson, E. S., Tillotson, C. J., Donovan, M. I., Yang, X., Petrik, A. F., Morasco, B. J., & Dobscha, S. K. (2013) · Spine · doi:10.1097/brs.0b013e3182830482 · Cited by 51
Self-citationO'connor, A., Turk, D. C., Dworkin, R. H., Katz, N. P., Colucci, R. D., Haythornthwaite, J. A., Klein, M., O’Brien, C. P., Posner, K., Rappaport, B. A., et al. (2013) · Pain · doi:10.1016/j.pain.2013.06.035 · Cited by 49
Cowan, D. T., Wilson-Barnett, D. J., Griffiths, P., Vaughan, D. J. A., Gondhia, A., & Allan, L. G. (2005) · Pain Medicine · doi:10.1111/j.1526-4637.2005.05020.x · Cited by 45
Krebs, E. E., Becker, W. C., Zerzan, J. T., Bair, M. J., McCoy, K. D., & Hui, S. L. (2011) · Pain · doi:10.1016/j.pain.2011.03.023 · Cited by 42
Mitra, F., Chowdhury, S. A., Shelley, M., & Williams, G. (2013) · Pain Medicine · doi:10.1111/pme.12011 · Cited by 39
Preliminary data on a new opioid risk assessment measure: The Brief Risk Interview
Jones, T., & Moore, T. (2013) · Journal of Opioid Management · doi:10.5055/jom.2013.0143 · Cited by 34
Mailis, A., Lakha, S. F., Ou, T., Louffat, A. F., Yegneswaran, B., Umana, M., Cohodarevic, T., Nicholson, K., & Deshpande, A. (2011) · PubMed Central · Cited by 34
Therapie chronischer Schmerzen mit oralem retardiertem Oxycodon
Gaertner, J., Frank, M., Bosse, B., Sabatowski, R., Elsner, F., Giesecke, T., & Radbruch, L. (2005) · Der Schmerz · doi:10.1007/s00482-005-0396-9 · Cited by 6
Research works printed but not linked: 3
- 1986, Pain Suppl, 3, S1
- Warner M, 2011, NCHS Data Brief, 1
- Mailis-Gagnon A, 2011, Can Fam Physician, 57, e97
Cited by
Sorted by citations
CDC Guideline for Prescribing Opioids for Chronic Pain—United States, 2016
Dowell, D., Haegerich, T. M., & Chou, R. (2016) · JAMA · doi:10.1001/jama.2016.1464 · Cited by 5,161
Self-citationRising morbidity and mortality in midlife among white non-Hispanic Americans in the 21st century
Case, A., & Deaton, A. (2015) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1518393112 · Cited by 2,759
CDC Guideline for Prescribing Opioids for Chronic Pain — United States, 2016
Dowell, D., Haegerich, T. M., & Chou, R. (2016) · MMWR. Recommendations and Reports · doi:10.15585/mmwr.rr6501e1 · Cited by 2,697
Self-citationMaher, C., Underwood, M., & Buchbinder, R. (2017) · The Lancet · doi:10.1016/s0140-6736(16)30970-9 · Cited by 2,535
New Persistent Opioid Use After Minor and Major Surgical Procedures in US Adults
Brummett, C. M., Waljee, J. F., Goesling, J., Moser, S., Lin, P., Englesbe, M. J., Bohnert, A. S. B., Kheterpal, S., & Nallamothu, B. K. (2017) · JAMA Surgery · doi:10.1001/jamasurg.2017.0504 · Cited by 2,025
Metadata
- Authors
- Chou, R., Turner, J. A., Devine, E. B., Hansen, R. N., Sullivan, S. D., Blazina, I., Dana, T., Bougatsos, C., & Deyo, R. A.
- Affiliations
- Oregon Health & Science University (US)
- ORCID
- Venue
- Annals of Internal Medicine
- Publisher
- American College of Physicians
- Published
- 2015-02-17
- Volume
- 162
- Issue
- 4
- Pages
- 276-286
- ISSN
- 0003-4819 (ISSN-L)
- 1539-3704
- OpenAlex
- W1965999023
- Cited by
- 1,606
- References
- 66
- Citations by year
- 2026: 68 · 2025: 101 · 2024: 123 · 2023: 127 · 2022: 135 · 2021: 157 · 2020: 180 · 2019: 175 · 2018: 171 · 2017: 163 · 2016: 143 · 2015: 59
- FWCI
- 25.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Annals of Internal Medicine (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Public Health Service (HHSA 290-2012-00014I)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Opioid Use Disorder Treatment
- Health Sciences › Medicine › Anesthesiology and Pain Medicine › Pain Management and Opioid Use
- Health Sciences › Medicine › Anesthesiology and Pain Medicine › Anesthesia and Pain Management
- Keywords
- long-term opioid therapy, chronic pain, opioid overdose, opioid abuse, opioid use disorder, opioid-related harms, opioid dosing, risk mitigation strategies, fracture risk, myocardial infarction, sexual dysfunction, quality of life, functions, non-opioid analgesics
- MeSH terms
- Analgesics, Opioid, Drug Administration Schedule, Humans, Myocardial Infarction, Opioid-Related Disorders, Quality of Life, Risk Factors, Sexual Dysfunction, Physiological, Risk Assessment, Fractures, Bone, Chronic Pain, Drug Overdose
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