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 Krle A-Jerić, Asbjørn Hrobjartsson, Howard Mann, Kay Dickersin, Jesse A. Berlin, Caroline J. Dore, Wendy R. Parulekar, William S.M. Summerskill, Trish Groves, Kenneth F. Schulz, Harold C. Sox, Frank W. Rockhold, Drummond Rennie, David Moher