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Articles (for healthcare professionals)
Pallone S., Bergus G. (2009) Fertility Awareness-Based Methods: Another Option for Family Planning, J. of Am. Board of Fam Med, 147-157.
www.jabfm.org/cgi/content/abstract/22/2/147
Hilgers T. Stanford J. (1998) Creighton Model NaProEducation Technology for Avoiding Pregnancy – Use Effectiveness, J Repr Med. 43(6) 495-502.