Comprehensive Assessment in a Longitudinal Study on Young Men Who Have Sex With Men Attracting to chemseX

The study is a two-phase observational study that assess multiple aspects of study and young men who have sex with men (YMSM). Phase I of the study will be a cross-sectional descriptive study using a mixed methods data collection (focusing on qualitative data collection) to acquire information necessary for developing a more extensive study on the same matter. Phase II of the study will be a prospective cohort study using a quantitative data collection. Findings from phase I will guide the development of phase II which consist of a larger number of YMSM, important baseline and follow-up questionnaires and comorbidities assessments, sexually transmitted infections testing, and integration to care. This protocol exclusively addresses the phase I of the study. Once the phase I findings are finalized, the principal investigator will submit the phase II to the IRB of the Faculty of Medicine, Chulalongkorn University.