[1] Univ San Francisco, Sch Nursing & Hlth Profess, Dept Populat Hlth Sci, 2130 Fulton, San Francisco, CA 94117 USA
[2] Univ Calif San Francisco, Inst Global Hlth Sci, San Francisco, CA USA
[3] Univ Calif Davis, Betty Irene Moore Sch Nursing, Sacramento, CA 95817 USA
[4] FHI 360, Phnom Penh, Cambodia
[5] Minist Hlth, Dept Mental Hlth & Subst Abuse, Phnom Penh, Cambodia
[6] Natl Author Combating Drugs, Phnom Penh, Cambodia
[7] Univ Miami, Sch Med, Dept Publ Hlth Sci, Miami, FL USA
[8] UNSW Sydney, Kirby Inst Infect & Immun, Sydney, NSW, Australia
[9] Univ New Mexico, Hlth Sci Ctr, Dept Internal Med, Div Epidemiol Biostat & Prevent Med, Albuquerque, NM USA