case control study cohort study epidemiology medicine malaria odds ratio rate incidence prevalence matching analytical study rr attributable rsik incidence rates follow up association causation rct blinding proportion ratio epidemiological approach john snow rfid rhd dots tuberculosis tb diabetes imnci. neonates childhood ilneess nacp hiv aids health thrombocytopenia obesity metabolic syndrome bmi bariatric surgery cross sectional study randomized control study clinical features prevention opv & ipv ppi vvm polio afp treatment of poliomyelitis exercise relative risk occupational health bias clinical trial cancer plasmodium vivax plasmodium falciparum lung cancer oral cancer breast cancer cervical cancer stomach cancer filariasis dec brugia dengue dhf dss
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