About the Authors

David Moher

To whom correspondence should be addressed. E-mail: dmoher@uottawa.ca

Affiliations Chalmers Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada , Department of Paediatrics, Faculty of Medicine, University of Ottawa, Ottawa, Canada , Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Canada

Jennifer Tetzlaff

Affiliation Chalmers Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada

Andrea C Tricco

Affiliations Chalmers Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada , Institute of Population Health, University of Ottawa, Ottawa, Canada

Margaret Sampson

Affiliation Chalmers Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada

Douglas G Altman

Affiliation Centre for Statistics in Medicine, Oxford, United Kingdom

Competing Interests

All of the authors are members of the Cochrane Collaboration. Four of the authors (DM, JT, MS, and DA) have been extensively involved with conceptualizing, developing, updating, and promoting the QUOROM Statement.

Author Contributions

DM, JT, MS, and DGA designed the study. JT analyzed the data. DM, JT, ACT, MS, and DGA contributed to writing the paper. JT and ACT helped screen articles for inclusion in the study and abstracted data. MS provided guidance to data abstractors in making ratings. ACT collected data or did experiments related to the study.