लेखक: Douglas Altman

Matthias Egger is professor of epidemiology and public health at the University of Bern in Switzerland, as well as professor of clinical epidemiology at the University of Bristol in the United Kingdom. George Davey-Smith is the editor of Systematic Reviews in Health Care: Meta-Analysis in Context, 2nd Edition, published by Wiley. Douglas G. Altman, Centre for Statistics in Medicine, University of Oxford and EQUATOR Network, Oxford, UK.