[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Psychiat & Biobehav Sci, Integrated Substance Abuse Programs, Los Angeles, CA 90095 USA
[2] Food & Drug Adm, Div Controlled Drugs, Minist Hlth & Welf, Taipei, Taiwan
[3] Natl Hlth Res Inst, Ctr Neuropsychiat Res, Miaoli, Taiwan
[4] Natl Inst Drug Abuse, Ctr Clin Trials Network, Bethesda, MD USA