RT Article T1 Nonmedical opioid use and heroin use in a nationally representative sample of US high school seniors JF Drug and alcohol dependence A1 Palamar, Joseph J. A1 Ompad, Danielle C. A1 Mateu-Gelabert, Pedro A1 Dawson, Eric W. A1 Shearston, Jenni A. A2 Ompad, Danielle C. A2 Mateu-Gelabert, Pedro A2 Dawson, Eric W. A2 Shearston, Jenni A. LA English YR 2016 UL https://krimdok.uni-tuebingen.de/Record/1912637766 DO 10.1016/j.drugalcdep.2015.11.005