Obtaining life history information about opioid users.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000368:Aged; D003219:Confidentiality; D005500:Follow-Up Studies; D006556:Heroin Dependence / Q000453:epidemiology*; D006760:Hospitalization; D006801:Humans; D007406:Interview, Psychological; D008137:Longitudinal Studies; D008297:Male; D008499:Medical Records; D008800:Mexico / Q000208:ethnology; D008875:Middle Aged; D011329:Prisoners; D013781:Texas; D013997:Time Factors