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, Hópital Bichat, Département d'Epidémiologie, Biostatistique et Recherche Clinique, Paris, France

Candice Estellat

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

Lydia Guittet

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

Agnes Dechartres

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

David L Sackett

Affiliation Trout Research and Education Centre at Irish Lake, Markdale, Ontario, 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, Hópital Bichat, Département d'Epidémiologie, Biostatistique et Recherche Clinique, Paris, France

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

IB, DLS, AH, and PR designed the study. IB analyzed the data. IB, CE, LG, LG, AD, DLS, AH, and PR contributed to writing the paper. IB, CE, LG, and AD collected data or did experiments for the study.