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Adv Contracept. 1997 Jun-Sep;13(2-3):167-71. doi: 10.1023/a:1006547820310.
Simplifying NFP: preliminary report of a pilot study of the 'collar' method in Brazil.
Faundes A, Lamprecht V, Osis MJ, Lopes BC
Research Library references a growing number of academic resources related to restorative reproductive medicine.
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