RT Article T1 Cognitive functioning of long-term heavy cannabis users seeking treatment JF The journal of the American Medical Association VO 287 IS 9 SP 1123 OP 1131 A1 Solowij, Nadia A2 Babor, Thomas F. A2 Roffman, Roger A. 1942- A2 Stephens, Robert S. LA English YR 2002 UL https://krimdok.uni-tuebingen.de/Record/191248224X DO 10.1001/jama.287.9.1123