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community medicine public health health epidemiology types of family functions of family water safe water safe and wholesome water wholesome water clean water drinking water sources of water uses of water water requirement sanitary well purification water purification purification of water boiling filtration chlorination disinfection disinfection of well water horrocks apparatus disaster disaster management psm community medicine' indicators health indicators indicators of health nutrition health problems micronutrients ai artificial intelligence ai in health ai in healthcare ai in public health healthcare family culture sociocultural impact on health family and health gis casper communicable disease non-communicable disease prevention control study designs epidemiological study designs cross-sectional cohort odds ratio relative risk case control mpi multidimensional poverty index poverty index economic evaluation full economic evaluation cea cba cua cma cost analysis culture and health chlorine demand bias confounding interaction mediator risk risk communication communication soco community rapid rapid method assessment quick survey lqas epi epi cluster sampling lot quality assurance sampling rea rapid epidemiologic methods case control methodoly transect walk