Taking chances?
Kipley
J
J
D003267:Contraception; D003268:Contraception Behavior; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D010061:Ovulation Detection
Cervical Mucus Method; Contraception; Contraception Failure--statistics; Contraceptive Usage; Evaluation; Evaluation Indexes; Family Planning; Family Planning, Behavioral Methods; Natural Family Planning; Quantitative Evaluation; Sympto-thermal Method