Study on anal human papillomavirus infection and anal intraepithelial neoplasia among men who have sex with men in Indonesia, Malaysia, and Thailand.

This is a prospective cohort study that will newly enroll approximately 150 MSM in Kuala Lumpur, Jakarta, and Bangkok and follow them prospectively with a group of 280 MSM who are previous participants of a study entitled "Multidisciplinary services to enhance HIV testing and linkage to care among MSM" (MSM VCT study) in Jakarta, Bali, and Bangkok. Newly enrolled MSM will have three study visits at baseline, month 6, and at month 12. MSM who are previous participants of the MSM VCT study will only have one study visit.