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
Annals of Internal Medicine · 2013
10.7326/0003-4819-158-3-201302050-00583