Media type: E-Article Title: State-of-the-art of non-hormonal methods of contraception: IV. Natural family planning Contributor: Freundl, Günter; Sivin, Irving; Batár, István Published: Informa UK Limited, 2010 Published in: The European Journal of Contraception & Reproductive Health Care, 15 (2010) 2, Seite 113-123 Language: English DOI: 10.3109/13625180903545302 ISSN: 1362-5187; 1473-0782 Keywords: Pharmacology (medical) ; Obstetrics and Gynecology ; Reproductive Medicine Origination: Footnote: