RT Article T1 Exploring age of onset as a causal link between major depression and nonmedical use of prescription medications JF Drug and alcohol dependence VO 120 IS 1-3 SP 99 OP 104 A1 Schepis, Ty S. A1 McCabe, Sean Esteban A2 McCabe, Sean Esteban LA English YR 2012 UL https://krimdok.uni-tuebingen.de/Record/1912551012 DO 10.1016/j.drugalcdep.2011.07.002