State-of-the-art of non-hormonal methods of contraception: IV. Natural family planning

@article{Freundl2010StateoftheartON,
  title={State-of-the-art of non-hormonal methods of contraception: IV. Natural family planning},
  author={G{\"u}nter Freundl and Irving Sivin and Istv{\'a}n Bat{\'a}r},
  journal={The European Journal of Contraception \& Reproductive Health Care},
  year={2010},
  volume={15},
  pages={113 - 123}
}
Despite the popularity of ‘modern’ contraceptives, natural family planning (NFP), including fertility awareness-based (FAB) methods and withdrawal, are practised in most countries. Worldwide FAB methods and withdrawal are used, respectively, by about 3.6% and 2.9% of all couples of reproductive age. This article describes the underpinnings of the different NFP methods, their rationales, histories, rules for use, efficacy and in broad categories their prevalence. Pregnancy rates of FAB methods… 
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