RT Article T1 A 2,5 year follow-up of cocaine use among treated opioid addicts JF Archives of general psychiatry VO 44 IS 3 SP 281 OP 285 A2 Kosten, Thomas LA English YR 1987 UL https://krimdok.uni-tuebingen.de/Record/1625883129 K1 Drogentherapie K1 Kokainmißbrauch