RT Article T1 Pathways between ecstasy initiation and other drug use JF Addictive behaviors A1 Martins, Silvia S. A2 Chilcoat, Howard D. A2 Ghandour, Lilian A. LA English YR 2007 UL https://krimdok.uni-tuebingen.de/Record/1912646021 DO 10.1016/j.addbeh.2006.11.003