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Front Public Health. 2017 Mar 13;5:42. doi: 10.3389/fpubh.2017.00042. eCollection 2017.
Use of Natural Family Planning (NFP) and Its Effect on Couple Relationships and Sexual Satisfaction: A Multi-Country Survey of NFP Users from US and Europe.
Unseld M, Rötzer E, Weigl R, Masel EK, Manhart MD
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