title: Invited commentary: should we estimate incidence for undefined populations?
authors.affiliation: Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7400, USA.
authors.forename: V J
authors.initials: VJ
authors.lastname: Schoenbach
authors.forename: C
authors.initials: C
authors.lastname: Poole
authors.forename: W C
authors.initials: WC
authors.lastname: Miller
mesh_terms: D015982:Bias; D003153:Community Health Services; D016021:Epidemiologic Studies; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D015995:Prevalence; D012107:Research Design; D012749:Sexually Transmitted Diseases