The following persons contributed to this version of the CONSORT statement: Frank Davidoff, MD, Annals of Internal Medicine (Philadelphia, Pennsylvania); Susan Eastwood, ELS(D), University of California, San Francisco (San Francisco, California); Matthias Egger, MD, University of Bristol (Bristol, United Kingdom); Diana Elbourne, PhD, London School of Hygiene and Tropical Medicine (London, United Kingdom); Peter Gøtzsche, MD, Nordic Cochrane Centre (Copenhagen, Denmark); Sylvan B. Green, PhD, MD, School of Medicine, Case Western Reserve University (Cleveland, Ohio); Leni Grossman, BA, Merck & Co., Inc. (Whitehouse Station, New Jersey); Barbara S. Hawkins, PhD, Wilmer Ophthalmological Institute, Johns Hopkins University (Baltimore, Maryland); Richard Horton, MB, The Lancet (London, United Kingdom); Wayne B. Jonas, MD, Uniformed Services University of the Health Sciences (Bethesda, Maryland); Terry Klassen, MD, University of Alberta (Edmonton, Alberta, Canada); Leah Lepage, PhD, Thomas C. Chalmers Centre for Systematic Reviews (Ottawa, Ontario, Canada); Thomas Lang, MA, Tom Lang Communications (Lakewood, Ohio); Jeroen Lijmer, MD, University of Amsterdam (Amsterdam, the Netherlands); Rick Malone, BS, TAP Pharmaceuticals (Lake Forest, Illinois); Curtis L. Meinert, PhD, Johns Hopkins University (Baltimore, Maryland); Mary Mosley, BS, Life Science Publishing (Tokyo, Japan); Stuart Pocock, PhD, London School of Hygiene and Tropical Medicine [London, United Kingdom]; Drummond Rennie, Journal of the American Medical Association, Chicago, Illinois); David S. Riley, MD, University of New Mexico Medical School (Santa Fe, New Mexico); Roberta W. Scherer, PhD, University of Maryland School of Medicine (Baltimore, Maryland); Ida Sim, MD, PhD, University of California, San Francisco (San Francisco, California); Donna Stroup, PhD, MSc, Centers for Disease Control and Prevention (Atlanta, Georgia). David Moher, Ken Schulz, and Doug Altman participated in regular conference calls, identified participants, contributed in the CONSORT meetings, and drafted the manuscript. David Moher and Leah Lepage planned the CONSORT meetings, identified and secured funding, invited the participants and planned the meeting agenda. The members of the CONSORT group listed above attended the consort meetings and provided input in the revised checklist, flow diagram and/or text of this manuscript. David Moher is the Guarantor of the manuscript.