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Krejza J, Nowacka A, Szylak A, Bilello M, Melhem LY. Variability of thyroid blood flow Doppler parameters in healthy women. „Ultrasound in medicine & biology”. 30 (7), s. 867–876, July 2004. DOI: 10.1016/j.ultrasmedbio.2004.05.008. PMID: 15313319. (ang.).
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The National Women’s Health Information Center: What is a typical menstrual period like?. U.S. Department of Health and Human Services, listopad 2002. [dostęp 2005-06-11]. [zarchiwizowane z tego adresu (2007-03-02)].