1. Institute of HIV Research and Innovation (IHRI), Bangkok 10330, Thailand
2. Department of Preventive and Social Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
3. The Service Workers In Group Foundation (SWING), Bangkok 10500, Thailand
4. Rainbow Sky Association of Thailand (RSAT), Bangkok 10240, Thailand
5. Thai Red Cross Anonymous Clinic, Thai Red Cross AIDS Research Centre (TRCARC), Bangkok 10330, Thailand
6. USAID/EpiC Thailand project, FHI 360, Bangkok 10330, Thailand