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Natural family planning with and without barrier method use in the fertile phase: efficacy in relation to sexual behavior: a German prospective long-term study.
Frank-Herrmann P, Freundl G, Gnoth C, Godehardt E, Kunert J, Baur S, Sottong U. Frank-Herrmann P, et al. Adv Contracept. 1997 Jun-Sep;13(2-3):179-89. doi: 10.1023/a:1006551921219. Adv Contracept. 1997. PMID: 9288336
Opinion: natural family planning and the management of infertility.
Gnoth C, Frank-Herrmann P, Freundl G. Gnoth C, et al. Arch Gynecol Obstet. 2002 Dec;267(2):67-71. doi: 10.1007/s00404-002-0293-8. Arch Gynecol Obstet. 2002. PMID: 12439549 Review.
Approaches to natural family planning.
Gnoth C. Gnoth C. Fertil Steril. 2000 Dec;74(6):1262-3. doi: 10.1016/s0015-0282(00)01652-6. Fertil Steril. 2000. PMID: 11188022 No abstract available.
[How do self-observed cycle symptoms correlate with ovulation?].
Gnoth C, Frank-Herrmann P, Bremme M, Freundl G, Godehardt E. Gnoth C, et al. Zentralbl Gynakol. 1996;118(12):650-4. Zentralbl Gynakol. 1996. PMID: 9082700 German.
The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study.
Frank-Herrmann P, Heil J, Gnoth C, Toledo E, Baur S, Pyper C, Jenetzky E, Strowitzki T, Freundl G. Frank-Herrmann P, et al. Hum Reprod. 2007 May;22(5):1310-9. doi: 10.1093/humrep/dem003. Epub 2007 Feb 20. Hum Reprod. 2007. PMID: 17314078
Monitoring the menstrual cycle: Comparison of urinary and serum reproductive hormones referenced to true ovulation.
Roos J, Johnson S, Weddell S, Godehardt E, Schiffner J, Freundl G, Gnoth C. Roos J, et al. Among authors: gnoth c. Eur J Contracept Reprod Health Care. 2015;20(6):438-50. doi: 10.3109/13625187.2015.1048331. Epub 2015 May 27. Eur J Contracept Reprod Health Care. 2015. PMID: 26018113 Clinical Trial.
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