[1] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[2] Univ Cent Florida, Sch Global Hlth Management & Informat, Orlando, FL USA
[3] RAND Corp, Pittsburgh, PA USA
[4] Univ Utah, Dept Internal Med, Program Addict Res Clin Care Knowledge & Advocacy, Div Epidemiol,Sch Med, Salt Lake City, UT USA
[5] Johns Hopkins Bloomberg Sch Publ Hlth, 624 N Broadway,Room 344, Baltimore, MD 21205 USA