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2. Knudtson K., McLaughlin J. E. Menstrual Cycle, Women's Health Issues. MSD Manuals (2019).
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4. Breast, Contemporary Health Issues. https://courses.lumenlearning.com/suny-contemporaryhealthissues/chapter/breasts/.
5. Waugh A., Grant A. Ross & Wilson Anatomy and Physiology in Health and Illness. Elsevier (2018).