Référence: Analysis of natural family planning failures. In 7007 cycles of use Ecochard, R.; Pinguet, F.; Ecochard, I.; De Gouvello, R.; Guy, M.; Huy, F. [Analysis of natural family planning failures. In 7007 cycles of use]. Contraception, Fertilite, Sexualite (1992) 1998: PMID: 9622963 | |