title: Choosing cases and controls: the clinical epidemiology of "clinical investigation".
authors.affiliation: Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06510.
authors.forename: A R
authors.initials: AR
authors.lastname: Feinstein
authors.forename: R I
authors.initials: RI
authors.lastname: Horwitz
mesh_terms: D002985:Clinical Protocols; D002986:Clinical Trials as Topic / Q000379:methods*; D004812:Epidemiologic Methods; D006801:Humans; D012107:Research Design