RT Article T1 Perceived cannabis use norms and cannabis use among adolescents in the United States JF Journal of psychiatric research A1 Wu, Li-Tzy A1 Hoyle, Rick H. A1 Brady, Kathleen T. 1952- A1 Swartz, Marvin S. A2 Hoyle, Rick H. A2 Brady, Kathleen T. 1952- A2 Swartz, Marvin S. LA English YR 2015 UL https://krimdok.uni-tuebingen.de/Record/1912648792 DO 10.1016/j.jpsychires.2015.02.022