Fertility awareness methods of family planning: the physiological background, methodology and effectiveness of fertility awareness methods.
Pyper
C M
CM
Health Services Research Unit, Department of Public Health, University of Oxford, Institute of Health Sciences, UK.
Knight
J
J
D005193:Family Planning Services / Q000379:methods*; D005260:Female; D005298:Fertility; D006801:Humans; D008297:Male; D010061:Ovulation Detection; D012098:Reproduction / Q000502:physiology*