About the Authors

Peter C Gøtzsche, Asbjørn Hróbjartsson, Helle Krogh Johansen, Mette T Haahr
Nordic Cochrane Centre, Copenhagen, Denmark

Douglas G Altman
Centre for Statistics in Medicine, Oxford, United Kingdom

An-Wen Chan
Department of Medicine, University of Toronto, Canada

Corresponding Author


Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

PCG initiated the study; PCG, AH, HKJ, MTH, DGA, and AWC contributed to study design, acquisition and interpretation of data, and writing the paper. PCG is guarantor.