RT Article T1 Initiation sequence of e-cigarette and cigarette smoking among US adolescents: A national study A1 McCabe, Sean Esteban A1 Boyd, Carol J. A1 McCabe, Vita V. A1 Veliz, Philip A2 Boyd, Carol J. A2 McCabe, Vita V. A2 Veliz, Philip LA English YR 2019 UL https://krimdok.uni-tuebingen.de/Record/1912592096 DO 10.1111/ajad.12886