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J Obstet Gynecol Neonatal Nurs. 2007 Mar-Apr;36(2):152-60. doi: 10.1111/j.1552-6909.2007.000129.x.
Efficacy of cervical mucus observations plus electronic hormonal fertility monitoring as a method of natural family planning.
Fehring RJ, Schneider M, Raviele K, Barron ML
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