... authors use random sampling to determinehouseholds or settings sampled?• Do the investigators succeed in interviewing a large pro-portion of the chosen sample?• Did the investigators institute ... sampling in 5 64 clusters [75.2%] that did not.Few households declined to participate in the survey: 22(0.16%) in the east and only three (0.05%) in the west.The investigators tried to minimize ... Tropical Medicine, London, UK, 3St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada, 4 Institute for Clinical Evaluative Sciences, University of Toronto, Toronto, Ontario,...