The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study.

Hum Reprod. 2007 May;22(5):1310-9. doi: 10.1093/humrep/dem003. Epub 2007 Feb 20.

Frank-Herrmann P, Heil J, Gnoth C, Toledo E, Baur S, Pyper C, Jenetzky E, Strowitzki T, Freundl G

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