The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception, 15(5), 380-382
This letter to the editor discusses a review article commenting on the efficacy of contraceptive methods. It takes issue with section focused on natural family planning methods (Billings ovulation method calendar methods symptothermal method etc) and finds fault with the authors not differentiating between the various natural methods. It states that if the authors consider it appropriate to differentiate between the various hormonal contraceptives then differentiation between the natural methods is mandatory.
Freundl, G. (n.d.). Efficacy of natural family planning methods. *The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception*.
Freundl G. Efficacy of natural family planning methods. Eur J Contracept Reprod Health Care..
Freundl, Günter. "Efficacy of natural family planning methods." *The European journal of contraception & reproductive health care : the official journal of the European Society of Contraception*.