Pregnancy outcome associated with natural family planning (NFP): scientific basis and experimental design for an international cohort study
Article
Simpson, JL, Gray, RH, Queenan, JT et al. (1988). Pregnancy outcome associated with natural family planning (NFP): scientific basis and experimental design for an international cohort study
. 4(4), 247-264. 10.1007/BF01849266
Simpson, JL, Gray, RH, Queenan, JT et al. (1988). Pregnancy outcome associated with natural family planning (NFP): scientific basis and experimental design for an international cohort study
. 4(4), 247-264. 10.1007/BF01849266