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Vietnam urban area rural area public health service mass screening methodology health care policy follow up human war priority journal respiratory tract disease disease course health care cost social status migrant Editorial allergen allergenicity Allergens asthma Dermatophagoides Viet Nam clinical evaluation risk factor primary prevention cockroach allergic disease environmental exposure chronic respiratory tract disease eczema high risk population population research Climate change prevalence pollution allergic reaction rhinoconjunctivitis medical service migration Transients and Migrants practice guideline dietary intake health practitioner health survey