School districts that are too difficult to reach (more than a 3-hour walk from the farthest place reachable by a four-wheel drive vehicle)
School districts in the 2 urban regions of the study area
Refusal of village chief
All residents residing near to the well sites that are randomly selected for this study.
Refusal of participant [or parent/guardian]

NCT02754583_exc_T1
Visit
School districts that are too difficult to reach
NCT02754583_exc_T2
Measurement
walk from the farthest place reachable by a four-wheel drive vehicle
NCT02754583_exc_T3
Value
more than a 3-hour
NCT02754583_exc_T4
Visit
School districts in the 2 urban regions of the study area
NCT02754583_exc_T6
Observation
residing
NCT02754583_exc_T7
Visit
near to the well sites