title: [Perinatal definition problems in our demography (author's transl)].
mesh_terms: D001724:Birth Weight; D005260:Female; D005313:Fetal Death; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D011247:Pregnancy; D013030:Spain
vernacular_title: Problemas conceptuales perinatales en nuestra demografía. Definiciones