PT - JOURNAL ARTICLE AU - C Onion AU - S Janikiewicz TI - Heroin users on a methadone programme. DP - 1993 May 01 TA - British Journal of General Practice PG - 216--217 VI - 43 IP - 370 4099 - http://bjgp.org/content/43/370/216.3.short 4100 - http://bjgp.org/content/43/370/216.3.full SO - Br J Gen Pract1993 May 01; 43