1 23 Administration and Policy in Mental Health and Mental Health Services Research ISSN 0894-587X Adm Policy Ment Health DOI 10.1007/s10488-015-0638-9 Effectiveness of Health System Services and Programs for Youth to Adult Transitions in Mental Health Care: A Systematic Review of Academic Literature Mark G. Embrett, Glen E. Randall, Christopher J. Longo, Tram Nguyen & Gillian Mulvale