[1] Iran Univ Med Sci, Sch Publ Hlth, Dept Epidemiol, Tehran, Iran
[2] Univ Tehran Med Sci, Sch Publ Hlth, Dept Epidemiol & Biostat, Tehran, Iran
[3] Kerman Univ Med Sci, HIV STI Surveillance Res Ctr, Kerman, Iran
[4] Kerman Univ Med Sci, WHO Collaborating Ctr HIV Surveillance, Inst Futures Studies Hlth, Kerman, Iran
[5] Univ Tehran Med Sci, Iranian Natl Ctr Addict Studies INCAS, Tehran, Iran
[6] Univ Calif San Francisco, San Francisco, CA USA
[7] Univ Calif San Francisco, Inst Global Hlth Sci, Dept Epidemiol & Biostat, San Francisco, CA USA