title: [How many patients?].
authors.affiliation: Service de Dermatologie, Hôpital Saint-Louis, 75475 Paris Cedex 10.
authors.forename: A
authors.initials: A
authors.lastname: Dupuy
authors.forename: J C
authors.initials: JC
authors.lastname: Guillaume
mesh_terms: D002986:Clinical Trials as Topic / Q000706:statistics & numerical data*; D006801:Humans; D018401:Sample Size