Chapter 1
Finding the Evidence
Kay Dickersin,
Kay Dickersin
Search for more papers by this authorKay Dickersin,
Kay Dickersin
Search for more papers by this authorBook Editor(s):Richard Wormald,
Liam Smeeth,
Katherine Henshaw,
Anupa Shah,
Richard Wormald
Consultant Ophthalmologist, Moorfields Eye Hospital, Honorary Senior Lecturer, London School of Hygiene and Tropical Medicine and Coordinating Editor, Cochrane Eyes and Vision, Group, London, UK
Search for more papers by this authorLiam Smeeth
Senior Lecturer in Clinical Epidemiology, London School of Hygiene and Tropical Medicine, General Practitioner, London and Editor, Cochrane Eyes and Vision Group, London, UK
Search for more papers by this authorKatherine Henshaw
Review Group Coordinator, Cochrane Eyes and Vision Group, London, UK
Search for more papers by this authorAnupa Shah
Trial Search Coordinator, Cochrane Eyes and Vision Group, London, UK
Search for more papers by this authorFirst published: 01 January 2005
Summary
This chapter contains section titled:
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Introduction
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Searching for published studies
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Searching for unpublished studies
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Conclusion
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References
References
- Canadian Task Force on Preventive Health Care. http://www.ctfphc.org, accessed on 26 May 2003.
- US National Library of Medicine MEDLINE Fact Sheet, 2000. http://www.nlm.nih.gov/pubs/factsheets/medline.html, accessed on 26 May 2003.
- Egger M, Zellweger-Zahner T, Schneider M, Junker C, Lengeler C, Antes G. Language bias in randomised controlled trials published in English and German. Lancet 1997; 350: 326–9.
- Joyce J, Rabe Hesketh S, Wessely S. Reviewing the reviews: the example of chronic fatigue syndrome. JAMA 1998; 280: 264–6.
- Barnes J, Abbot NC, Harkness EF, Ernst E. Articles on complementary medicine in the mainstream medical literature: an investigation of MEDLINE, 1966 through 1996. Arch Int Med 1999; 159: 1721–5.
- Dickersin K, Scherer R, Lefebvre C. Identifying relevant studies for systematic reviews. BMJ 1994; 309: 1286–91.
- Dickersin K, Manheimer E, Wieland LS et al. Development of a Centralized Register of Controlled Clinical Trials: The Cochrane Collaboration’s CENTRAL Database. Eval Health Professions 2002; 25: 38–64.
- Avenell A, Handoll HH, Grant AM. Lessons for search strategies from a systematic review, in the Cochrane Library, of nutritional supplementation trials in patients after hip fracture. Am J Clin Nutr 2001; 73: 505–10.
- Suarez Almazor ME, Belseck E, Homik J, Dorgan M, Ramos Remus C. Identifying clinical trials in the medical literature with electronic databases: MEDLINE alone is not enough. Control Clin Trials 2000; 21: 476–87.
- Scherer RW, Langenberg P. Full publication of results initially presented in abstracts (Cochrane Methodology Review). In: Cochrane Collaboration: Cochrane Library. Issue 1. Oxford: Update Software, 2002.
- McAuley L, Pham B, Tugwell P, Moher D. Does the inclusion of grey literature influence estimates of intervention effectiveness reported in meta-analyses? Lancet 2000; 356: 1228–31.
- Dickersin K, Scherer R, Lefebvre C. Identification of relevant studies for systematic reviews. BMJ 1994; 309: 1286–91.
- Hopewell S, Clarke M, Lusher A, Lefebvre C, Westby M. A comparison of handsearching versus electronic searching to identify reports of randomized trials. Stat Med 2002; 21: 1625–34.
- Mallett S, Hopewell S, Clarke M. Grey literature in systematic reviews: The first 1000 Cochrane systematic reviews. In: 4th Symposium on Systematic Reviews: Pushing the Boundaries, 2–4 July 2002, Oxford, UK. Abstract no 5.
- Pao ML. Perusing the literature via citation links [published erratum]. Comput Biomed Res 1993; 26: 143–56.
- Gotzsche PC. Reference bias in reports of drug trials. BMJ (Clin Res Ed). 1987; 295: 654–6.
- Ravnskov U. Cholesterol lowering trials in coronary heart disease: frequency of citation and outcome. BMJ 1992; 305: 15–19.
- Hutchinson BG, Oxman AD, Lloyd S. Comprehensiveness and bias in reporting clinical trials. Can Fam Physician 1995; 41: 1356–60.
- Dickersin K. How important is publication bias? A synthesis of available data. AIDS Educ Prev 1997; 9 (Suppl 1): 15–21.
- Dickersin K, Min YI. NIH clinical trials and publication bias. Online J Curr Clin Trials 1993; Doc No 50.
- Simes RJ. Publication bias: the case for an international registry of clinical trials. J Clin Oncol 1986; 4: 1529–41.
- Easterbrook PJ, Berlin JA, Gopalan R, Matthews DR. Publication bias in clinical research. Lancet 1991; 337: 867–72.
- Herxheimer A. Data on file cited in pharmaceutical advertisements: What are they? The International Congress on Biomedical Peer Review and Global Communications, September 1997, Prague, Czech Republic, 1997.
- Hadhazy V, Ezzo J, Berman B. How valuable is effort to contact authors to obtain missing data in systematic reviews? 7th Annual Cochrane Colloquium Abstracts, October 1999, Rome, Italy, 1999.
- Walters EH, Walters JA. Many reports of RCTs give insufficient data for Cochrane reviewers. BMJ 1999; 319: 257.
- Hetherington J, Dickersin K, Chalmers I, Meinert CL. Retrospective and prospective identification of unpublished controlled trials: lessons from a survey of obstetricians and pediatricians. Pediatrics 1989; 84: 374–80.
- McCray AT. Better access to information about clinical trials. Ann Intern Med 2000; 133: 609–14.
- Manheimer E, Anderson D. Survey of public information about ongoing clinical trials funded by industry: evaluation of completeness and accessibility. BMJ 2002; 325: 528–31.
- Dickersin K. Systematic reviews in epidemiology: Why are we so far behind? Int J Epidemiol 2002; 31: 6–12.
