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New technology in natural family planning.
Fehring RJ. Fehring RJ. J Obstet Gynecol Neonatal Nurs. 1991 May-Jun;20(3):199-205. doi: 10.1111/j.1552-6909.1991.tb02531.x. J Obstet Gynecol Neonatal Nurs. 1991. PMID: 2056356
82 results