title: Understanding the 'what' before the 'why' in population research.
authors.forename: John J
authors.initials: JJ
authors.lastname: Frey
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000453:epidemiology; D002986:Clinical Trials as Topic; D019337:Hematologic Neoplasms / Q000453:epidemiology; D006801:Humans; D008585:Meningitis, Meningococcal / Q000175:diagnosis / Q000628:therapy; D009658:North Dakota / Q000453:epidemiology; D011159:Population Surveillance; D012107:Research Design; D012307:Risk Factors; D012424:Rural Population; D016728:Self-Injurious Behavior; D014505:Urban Population; D014922:Wisconsin / Q000453:epidemiology