Periodieke onthouding
type: Concept
editorial note: -PV
main entity of page: http://data.bibliotheken.nl/doc/thes/p078626064
main entity of page: https://koninklijkebibliotheek.triply.cc/.well-known/genid/f61a9d8065fbe6865b208ebff31aa565
alternative label: Methode Ogino-Knaus
in scheme: gtt
preferred label: Rhythm method @en
related: p078512891
related: p113085370