The Cochrane Collaboration: Evaluation of Health Care and Services Using Systematic Reviews of the Results of Randomized Controlled Trials

Baltimore Cochrane Center, University of Maryland School of Medicine, Baltimore, Maryland Correspondence: Kay Dickersin, PhD, Director Baltimore Cochrane Center, Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, 506 West Fayette Street, First Floor, Baltimore, MD 21201; e-mail: email protected