RT Article T1 Adolescent marijuana use from 2002 to 2008: higher in states with medical marijuana laws, cause still unclear JF Annals of epidemiology VO 21 IS 9 SP 714 OP 717 A1 Wall, Melanie M. A2 Hasin, Deborah S. A2 Galea, Sandro 1971- A2 Keyes, Katherine M. A2 Cerdá, Magdalena A2 Poh, Ernest LA English YR 2011 UL https://krimdok.uni-tuebingen.de/Record/1912450186 DO 10.1016/j.annepidem.2011.06.001