TY - JOUR KW - Adolescent KW - Adult KW - Analgesics, Opioid/therapeutic use KW - Cross-Sectional Studies KW - Drug Use KW - Humans KW - Logistic Models KW - Male KW - Medication Adherence KW - Methadone KW - Methadone/therapeutic use KW - Mountainous KW - Opiate Substitution Treatment KW - Opioid-Related Disorders/drug therapy/epidemiology KW - Psychiatric Status Rating Scales KW - Quality of Life KW - Severity of Illness Index KW - Social Class KW - Surveys and Questionnaires KW - Vietnam KW - Vietnam/epidemiology KW - Young Adult AU - B. X. Tran AU - V. L. Boggiano AU - H. L. Thi Nguyen AU - L. H. Nguyen AU - H. V. Nguyen AU - C. D. Hoang AU - H. T. Le AU - T. D. Tran AU - H. Q. Le AU - C. A. Latkin AU - T. M. Thi Vu AU - M. W. Zhang AU - R. C. Ho A1 - BT - BMJ open C5 - Opioids & Substance Use CP - 3 CY - England DO - 10.1136/bmjopen-2017-015875 IS - 3 JF - BMJ open PP - England PY - 2018 SN - 2044-6055; 2044-6055 T1 - Concurrent drug use among methadone maintenance patients in mountainous areas in northern Vietnam T2 - BMJ open TI - Concurrent drug use among methadone maintenance patients in mountainous areas in northern Vietnam U1 - Opioids & Substance Use U2 - 29567839 U3 - 10.1136/bmjopen-2017-015875 VL - 8 VO - 2044-6055; 2044-6055 Y1 - 2018 ER -