title: Core groups by any other name?
authors.forename: J J
authors.initials: JJ
authors.lastname: Potterat
authors.forename: J B
authors.initials: JB
authors.lastname: Muth
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D012749:Sexually Transmitted Diseases / Q000453:epidemiology / Q000635:transmission; D009626:Terminology as Topic; D014481:United States