All field staff was required to successfully complete an extensive nine-day training program before beginning door-to-door recruitment efforts in the field. Part of the training required the principal investigators to present the study's objectives and design. The ability of the field staff to obtain cooperation of participants by effectively answering questions and addressing concerns was critical to our recruitment efforts. The field staff was also trained to request a revisit to households who were undecided about enrolling in the study. This allowed us to avoid any impression that we wanted to coerce participation, and it provided eligible participants time to make an informed decision.
