title: Trials of the ovulation method of natural family planning.
mesh_terms: D000569:Americas; D001208:Asia; D001210:Asia, Southeastern; D001315:Australia; D002489:Central America; D003267:Contraception; D019049:Developed Countries; D003906:Developing Countries; D004493:Education; D004544:El Salvador; D005060:Europe; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D007194:India; D007494:Ireland; D007843:Latin America; D012252:Natural Family Planning Methods; D009656:North America; D010061:Ovulation Detection; D010139:Pacific Islands; D010679:Philippines; D012736:Sex Education; D012959:Socioeconomic Factors
keywords: Americas; Asia; Australia; Central America; Cervical Mucus Method; Contraception; Contraceptive Effectiveness; Developed Countries; Developing Countries; Education; El Salvador; Europe; Evaluation; Family Planning; Family Planning Education; Family Planning, Behavioral Methods; India; Ireland; Latin America; Natural Family Planning; North America; Northern Europe; Oceania; Philippines; Rhythm Method, Calendar; Socioeconomic Factors; Southeastern Asia; Southern Asia; Use-effectiveness