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Calendar method unreliable in family planning, study says
I publikationen Manila Bulletin (2001)Artikel -
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Standard days method bagong paraan ng natural na pagpaplano ng pamilya
I publikationen Kabayan (2001)Artikel -
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And they call it "rhythm" the practice of periodic abstinence in Bicol and the Visayas regions
Publicerad 1985Hämta fulltext
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