Note on the Takahashi effect.
D001719:Birth Certificates; D004739:England; D005260:Female; D005313:Fetal Death; D006801:Humans; D007086:Illegitimacy; D007231:Infant, Newborn; D007564:Japan; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D011247:Pregnancy; D012744:Sex Ratio; D014852:Wales