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Adv Contracept. 1995 Jun;11(2):173-85. doi: 10.1007/BF01987282.
Sexual behavior of natural family planning users in Germany and its changes over time.
Gnoth C, Frank-Herrmann P, Freundl G, Kunert J, Godehardt E
Research Library references an ever-growing number of academic resources related to restorative reproductive medicine.
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