About the Authors

Isabelle Boutron

To whom correspondence should be addressed. E-mail: isabelle.boutron@bch.ap-hop-paris.fr

Affiliations INSERM, U738, Paris, France , Université Paris 7, UFR de Médecine, Paris, France , AP-HP, Hôpital Bichat, Département d'Epidémiologie, Biostastique et Recherche Clinique, Paris, France

Lydia Guittet

Affiliations INSERM, U738, Paris, France , Université Paris 7, UFR de Médecine, Paris, France , AP-HP, Hôpital Bichat, Département d'Epidémiologie, Biostastique et Recherche Clinique, Paris, France

Candice Estellat

Affiliations INSERM, U738, Paris, France , Université Paris 7, UFR de Médecine, Paris, France , AP-HP, Hôpital Bichat, Département d'Epidémiologie, Biostastique et Recherche Clinique, Paris, France

David Moher

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

Asbjørn Hróbjartsson

Affiliation Nordic Cochrane Centre, Rigshospitalet, Copenhagen, Denmark

Philippe Ravaud

Affiliations INSERM, U738, Paris, France , Université Paris 7, UFR de Médecine, Paris, France , AP-HP, Hôpital Bichat, Département d'Epidémiologie, Biostastique et Recherche Clinique, Paris, France

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

IB, AH, and PR designed the study. IB, LG, and CE acquired the data. IB, LG, CE, DM, AH, and PR analyzed and interpreted the data. IB drafted the article. LG, CE, DM, AH, and PR critically revised the article for important intellectual content. IB, LG, CE, DM, AH, and PR gave final approval of the version to be published.