Response to questionnaires.
D001291:Attitude of Health Personnel; D004812:Epidemiologic Methods; D006801:Humans; D008404:Massachusetts; D010437:Peptic Ulcer / Q000453:epidemiology; D010820:Physicians; D012237:Rhode Island; D012907:Smoking / Q000453:epidemiology*; D011795:Surveys and Questionnaires