The Billings Ovulation Method. An update.
Billings
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D002582:Cervix Mucus / Q000378:metabolism; D003267:Contraception / Q000379:methods; D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000628:therapy; D010061:Ovulation Detection / Q000379:methods*; D011247:Pregnancy