title: An evaluation of the use-effectiveness of fertility awareness methods of family planning.
mesh_terms: D000293:Adolescent; D000328:Adult; D005193:Family Planning Services; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D008875:Middle Aged; D012252:Natural Family Planning Methods; D010043:Outcome and Process Assessment, Health Care; D011247:Pregnancy