1. Thailand Ministry of Public Health—U.S., Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand
2. Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Department of Disease Control, Thailand Ministry of Public Health, Nonthaburi, Thailand
4. Thai Red Cross AIDS Research Centre and HIV Netherlands Australia Thailand Collaboration (HIVNAT), Bangkok, Thailand
5. Division of Preventive Medicine and Public Health, Department of Epidemiology and Biostatistics, University of California at San Francisco, San Francisco, California, USA
6. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA