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.
Frank-Herrmann, P. 1,8,+; Heil, J. 2,+; Gnoth, C. 3; Toledo, E. 4; Baur, S. 5; Pyper, C. 6; Jenetzky, E. 7; Strowitzki, T. 1; Freundl, G. 5
22(5):1310-1319, May 2007.
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