title: Dichotomization of primary outcomes serves external validity.
authors.affiliation: UFR de Médecine, Université Rennes 1, Rennes, France; Pharmaco-Epidemiology Unit, INSERM EA0203, Rennes, France; Service de Dermatologie, Centre Hospitalier Universitaire, Rennes, France. Electronic address: alain.dupuy@chu-rennes.fr.
authors.forename: Alain
authors.initials: A
authors.lastname: Dupuy
authors.affiliation: INSERM_U938, Centre de Recherche Saint Antoine, Paris, France.
authors.forename: Dany
authors.initials: D
authors.lastname: Nassar
mesh_terms: D003880:Dermatology; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design; D012871:Skin Diseases / Q000628:therapy*