National Center for Biotechnology Information NCBI NLM MEDLINE clinical trials as topic humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't u.s. gov't female male P.H.S. Diarrhea / epidemiology Rural Population diarrhea / prevention & control malaria / prevention & control kenya / epidemiology population surveillance / methods* prevalence influenza human / prevention & control research design malaria / epidemiology demography human / epidemiology pmid:22933646 doi:10.1093/ije/dys108 frank o odhiambo kayla f laserson john m vulule data collection / methods tuberculosis / epidemiology tuberculosis / prevention & control