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Geburtshilfe Frauenheilkd. 1982 Jan;42(1):66-9. doi: 10.1055/s-2008-1036626.
[Natural family planning: ovulation method after Billings (author's transl)].
Meier-Vismara E, Meier-Vismara U
Research Library references an ever-growing number of academic resources related to restorative reproductive medicine.
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