Simplifying NFP: preliminary report of a pilot study of the 'collar' method in Brazil

Author: Faundes A.   Lamprecht V.   Osis M.J.   Lopes B.C.  

Publisher: Springer Publishing Company

ISSN: 0267-4874

Source: Advances in Contraception, Vol.13, Iss.2-3, 1997-06, pp. : 167-171

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