Recruiting methods Participants will be recruited from the selected study neighborhoods for baseline and follow-up studies using a venue-based application of time-space sampling (Muhib et al., 2001). The method involves first identifying venues, places at which members of the target population may be found, then identifying days and times during which members of the target population are likely to be found at the selected venues. After venue day-time (VDT) units are identified, forming a sampling frame, a random sample of VDTs is selected and eligible members of the target population are systematically sampled within selected VDTs.