To reduce risk of contamination, we planned to vary the intervention and the comparison group based on their residence using kebele (the smallest administrative unit) for residents of Jimma town and woreda or district for those outside of Jimma town. Because of the inconvenience to vary days of appointment, where those supposed to come on Monday were coming on Tuesday and those supposed to come on Monday were coming on Tuesday, that created a high risk of mix-up of participants. Because of this reason, though the baseline was collected from February 2016 to May 2016, the intervention was delayed by five months and then started on November.