title: Onset and duration: measurement and analysis.
authors.affiliation: Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962.
authors.forename: E M
authors.initials: EM
authors.lastname: Laska
authors.forename: C
authors.initials: C
authors.lastname: Siegel
authors.forename: A
authors.initials: A
authors.lastname: Sunshine
mesh_terms: D002986:Clinical Trials as Topic; D004358:Drug Therapy; D006801:Humans