Wennberg, D. E., F. L. Lucas, J. D. Birkmeyer, C. E. Bredenberg, and E. S. Fisher. 1998. Variation in carotid endarterectomy mortality in the Medicare population: Trial hospitals, volume, and patient characteristics. JAMA 279(16):1278–1281.
Whitlock, E. P., E. A. O’Connor, S. B. Williams, T. L. Beil, and K. W. Lutz. 2008. Effectiveness of weight management programs in children and adolescents. Rockville, MD: AHRQ.
Wieland, S., and K. Dickersin. 2005. Selective exposure reporting and Medline indexing limited the search sensitivity for observational studies of the adverse effects of oral contraceptives. Journal of Clinical Epidemiology 58(6):560–567.
Wilczynski, N. L., R. B. Haynes, A. Eady, B. Haynes, S. Marks, A. McKibbon, D. Morgan, C. Walker-Dilks, S. Walter, S. Werre, N. Wilczynski, and S. Wong. 2004. Developing optimal search strategies for detecting clinically sound prognostic studies in MEDLINE: An analytic survey. BMC Medicine 2:23.
Wilt, T. J. 2006. Comparison of endovascular and open surgical repairs for abdominal aorticaneurysm. Rockville, MD: AHRQ.
Wood, A. J. J. 2009. Progress and deficiencies in the registration of clinical trials. NewEngland Journal of Medicine 360(8):824–830.
Wood, A. M., I. R. White, and S. G. Thompson. 2004. Are missing outcome data adequately handled? A review of published randomized controlled trials in major medical journals. Clinical Trials 1(4):368–376.
Wood, L., M. Egger, L. L. Gluud, K. F. Schulz, P. Jüni, D. G. Altman, C. Gluud, R. M. Martin, A. J. Wood, and J. A. Sterne. 2008. Empirical evidence of bias in treatment effect estimates in controlled trials with different interventions and outcomes: Meta-epidemiological study. BMJ 336(7644):601–605.
Wortman, P. M., and W. H. Yeaton. 1983. Synthesis of results in controlled trials of coronary bypass graft surgery. In Evaluation studies review annual, edited by R. L. Light. Beverly Hills, CA: Sage.
Yoshii, A., D. A. Plaut, K. A. McGraw, M. J. Anderson, and K. E. Wellik. 2009. Analysis of the reporting of search strategies in Cochrane systematic reviews. Journal ofthe Medical Library Association 97(1):21–29.
Zarin, D. A. 2005. Clinical trial registration. New England Journal of Medicine 352(15):1611.
Zarin, D. A., T. Tse, and N. C. Ide. 2005. Trial registration at ClinicalTrials.gov between May and October 2005. New England Journal of Medicine 353(26):2779–2787.