title: [Study on aggregation month of perinatal deaths for each prefecture (author's transl)].
mesh_terms: D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007564:Japan; D008297:Male; D011247:Pregnancy; D012621:Seasons; D012737:Sex Factors