Table 1.

Data collection methods, investigators and participant categories.

SL	Data source	Data collection technique	Participant type(s)	Data collector(s)	Rationale
1	Research	In-depth interview (IDI)	Young and adolescent MSM and self-identified gay men	Anthropologists, sociologist, public health experts	To elicit an in-depth understanding of the underlying contexts, socio-sexual dynamics and effects of drug intake on their sexual activities.
2		Focus group discussions (FGDs)			To provide a breadth of understanding of the normative and societal perspectives regarding chemsex among this group.
3	Pilot interventions (same strategies were used for both of the interventions)	Informal discussions	Young and adolescent MSM and self-identified gay men	Psychologists, clinical psychologists, and data collector from the target population	To explore and understand the socio-sexual and cultural dynamics of chemsex, drug use patterns, sexual behaviors and their service needs
4			Service providers of DICs (i.e., DIC managers, peer educators, medical assistant)	Psychologists, clinical psychologists, counselors, physicians, anthropologists	To understand and explore the reasons and implications for partaking in chemsex on a broader community level
5		Service register	Quantitative information	Counselors and physicians belonging to the pilot project	To understand the number of participants who have engaged in chemsex
6			Field diaries (Qualitative)	Counselors and physicians belonging to the pilot project	To understand the common socio-sexual scenarios leading to chemsex, drug use patterns, and sexual behaviors
7		Programmatic monitoring and evaluation visits	Young and adolescent MSM and self-identified gay men	Physicians, counselors and programmatic experts (e.g., sociologists, anthropologists, demographers, etc.)	To understand the service needs and uptake, as well as the overall dynamics of chemsex