Spirit 2013 statement: Defining standard protocol items for clinical trials

An Wen Chan, Jennifer M. Tetzlaff, Douglas G. Altman, Andreas Laupacis, Peter C. Gøtzsche, Karmela Krleža-Jerić, Asbjørn Hróbjartsson, Howard Mann, Kay Dickersin, Jesse A. Berlin, Caroline J. Doré, Wendy R. Parulekar, William S.M. Summerskill, Trish Groves, Kenneth F. Schulz, Harold C. Sox, Frank W. Rockhold, Drummond Rennie, David Moher