title: Preregistration: when shall we start the real discussion?
authors.affiliation: Department Clinical Epidemiology, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands J.P.Vandenbroucke@lumc.nl.
authors.forename: Jan P
authors.initials: JP
authors.lastname: Vandenbroucke
mesh_terms: D002985:Clinical Protocols / Q000592:standards*; D016021:Epidemiologic Studies; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000592:standards*