title: [Test persons and control groups--psychological and epidemiological viewpoints].
mesh_terms: D002986:Clinical Trials as Topic; D004812:Epidemiologic Methods; D006801:Humans; D011594:Psychometrics; D012106:Research; D013223:Statistics as Topic
vernacular_title: Versuchsperonen und Kontrollgruppen--psychologische und epidemiologische Gesichtspunkte.