Author Contributions: Dr Gøtzsche had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Gøtzsche, Hróbjartsson.
Acquisition of data: Gøtzsche, Hróbjartsson, Marić, Tendal.
Analysis and interpretation of data: Gøtzsche, Hróbjartsson, Tendal.
Drafting of the manuscript: Gøtzsche.
Critical revision of the manuscript for important intellectual content: Gøtzsche, Hróbjartsson, Marić, Tendal.
Statistical analysis: Gøtzsche, Tendal.
Administrative, technical, or material support: Gøtzsche, Tendal.
Study supervision: Gøtzsche.
Financial Disclosures: None reported.
Funding/Support: The study was not funded.
Additional Contributions: We thank senior statistician Julian Higgins, MRC, Biostatistics Unit, University of Cambridge, England, for comments on the manuscript and the following authors for providing additional information on their meta-analyses: Ruth Barclay-Goddard, MHSc, University of Manitoba; Barbara Brady-Fryer, RN, University of Ottawa, Ottawa, Ontario; Peter den Boer, MD, University Hospital Groningen, Groningen, the Netherlands; Chen Junmin, MD, Australasian Cochrane Centre, Melbourne, Australia; Chris Deery, MD, Edinburgh Dental Institute, Edinburgh, Scotland; Pasquale Frisina, PhD, City University of New York, New York; Peter Gibson, MB, BS, FRACP, John Hunter Hospital, Newcastle, Australia; Peter Griffiths, MD, Florence Nightingale School of Nursing and Midwifery at King's College, London, England; Kåre B. Hagen, MD, Diakonhjemmet Hospital, Oslo, Norway; Lisa Hartling, BScPT, MSc, University of Alberta, Edmonton; Jan Kool, PhD, Klinik Valens Rehabilitationszentrum, Valens, Switzerland; Gert Kwakkel, MD, University Hospital Vrije Universiteit, Amsterdam, the Netherlands; Hugh McGuire, Trials Search Coordinator, Cochrane Depression, Anxiety and Neurosis Group, London, England; Colleen Murphy, International Medical Corps, Santa Monica, California; Dr Edward Nuñes, MD, New York State Psychiatric Institute, New York; Hema Patel, MD, MSc, FRCP, Montreal Children's Hospital, Montreal, Quebec; M. Florent Richy, MSc, University of Liège, Belgium; Natasha Wiebe, MMath, University of Alberta, Edmonton. None of those acknowledged received compensation for their contributions.