title: A rational approach to the "at risk" concept.
mesh_terms: D001984:Bronchial Neoplasms / Q000209:etiology*; D002277:Carcinoma / Q000209:etiology; D003327:Coronary Disease / Q000453:epidemiology / Q000209:etiology* / Q000401:mortality; D004781:Environmental Exposure; D004812:Epidemiologic Methods; D004813:Epidemiology; D006801:Humans; D006937:Hypercholesterolemia / Q000150:complications; D006973:Hypertension / Q000150:complications; D009017:Morbidity; D009369:Neoplasms / Q000453:epidemiology / Q000209:etiology*; D012907:Smoking / Q000150:complications; D009626:Terminology as Topic