Itaya, Y., N. Kuramoto, and Y. Furukawa. “Menstrual Cup Use in Japanese Women: Subjective Evaluations and Changes in Menstrual Symptoms”. Women, Midwives and Midwifery, vol. 2, no. 2, June 2022, pp. 1-14, https://wmmjournal.org/index.php/wmm/article/view/55.