RT Article T1 Using a group-based trajectory approach to assess risk and protective factors of marijuana use JF Journal of drug issues A1 Eassey, John M. A2 Krohn, Marvin D. 1947- A2 Gibson, Chris L. LA English YR 2014 UL https://krimdok.uni-tuebingen.de/Record/1912738813 DO 10.1177/0022042614542508