Media type: E-Article Title: Long-Term Effects of the Life Skills Program IPSY on Substance Use: Results of a 4.5-Year Longitudinal Study Contributor: Weichold, Karina; Blumenthal, Anja Published: Springer Science and Business Media LLC, 2016 Published in: Prevention Science, 17 (2016) 1, Seite 13-23 Language: English DOI: 10.1007/s11121-015-0576-5 ISSN: 1389-4986; 1573-6695 Origination: Footnote: