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2. Twelve-year follow-up of New York narcotic addicts;Vaillant;New England J. Med.,1966
3. A follow-up of narcotic addicts;O'Donnell;Am. J. Orthopsychiat.,1964
4. Follow-up study of narcotic drug addicts five years after hospitalization;Duvall;Pub. Health Rep.,1963
5. A Follow-Up Study of Treated Adolescent Narcotic Users;Columbia University School of Public Health and Administrative Medicine,1959