Natural family planning.
Nowland
D
D
D001519:Behavior; D003267:Contraception; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D012252:Natural Family Planning Methods; D010061:Ovulation Detection; D011584:Psychology
Behavior; Cervical Mucus Method; Contraception; Contraceptive Effectiveness; Family Planning; Family Planning, Behavioral Methods; Natural Family Planning; Psychological Factors; Rhythm Method, Calendar; Theoretical Effectiveness; Use-effectiveness