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5. My journey to natural family planning. Staicer C Midwifery Today Int Midwife; 1999; (51):34-5, 65. PubMed ID: 10808872 [No Abstract] [Full Text] [Related]
6. New low- and high-tech calendar methods of family planning. Fehring RJ J Midwifery Womens Health; 2005; 50(1):31-8. PubMed ID: 15637512 [TBL] [Abstract][Full Text] [Related]
7. Family planning by periodic abstinence. Moore WM Practitioner; 1975 Jan; 214(1279):99-104. PubMed ID: 1096116 [No Abstract] [Full Text] [Related]