[Natural family planning].
Freundl
G
G
D003906:Developing Countries; D005193:Family Planning Services / Q000706:statistics & numerical data*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007231:Infant, Newborn; D012252:Natural Family Planning Methods; D011247:Pregnancy; D015203:Reproducibility of Results
Natürliche Familienplanung.