Statistical analysis on anencephaly, spina bifida and congenital hydrocephaly in Japan.
D000757:Anencephaly / Q000401:mortality*; D001722:Birth Order; D003644:Death Certificates; D004200:Diseases in Twins; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D006849:Hydrocephalus / Q000401:mortality*; D007226:Infant Mortality; D007231:Infant, Newborn; D007564:Japan; D008423:Maternal Age; D009790:Occupations; D011247:Pregnancy; D012621:Seasons; D012744:Sex Ratio; D016135:Spinal Dysraphism / Q000401:mortality*