title: Epidemiologic studies of immigrants urged.
mesh_terms: D000293:Adolescent; D000328:Adult; D004641:Emigration and Immigration / Q000639:trends*; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D011247:Pregnancy; D011295:Prenatal Care / Q000523:psychology*; D014481:United States