2.5. Randomization, allocation concealment, and blinding
Simple randomization of participants was performed by generating a random number sequence using Stata v.15. The number sequence was stored on an encrypted electronic file, and one researcher was the only study staff member with access to this information. Participants, following the order of enrolment in the study, were assigned to an intervention or control group according to the corresponding random sequence number. Study investigators, peer facilitators and participants were blinded to participant allocation.