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J Midwifery Womens Health. 2005 Jan-Feb;50(1):31-8. doi: 10.1016/j.jmwh.2004.07.001.
New low- and high-tech calendar methods of family planning.
Fehring RJ
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J Midwifery Womens Health. 2005 Jan-Feb;50(1):31-8. doi: 10.1016/j.jmwh.2004.07.001.
Fehring RJ