title: [Research on usual care: Methodological issues].
authors: 92, rue d'Alésia, 75014 Paris, France. Electronic address: f.lemaire@numericable.com.
authors: François
authors: F
authors: Lemaire
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D003695:Delivery of Health Care; D006801:Humans; D012107:Research Design