RT Article T1 Medical maintenance: a pilot study JF Journal of addictive diseases VO 12 IS 4 SP 59 OP 76 A1 Senay, Edward C. A2 Barthwell, Andrea G. A2 Marks, Robert LA English YR 1993 UL https://krimdok.uni-tuebingen.de/Record/1640311157 K1 Methadon