Sehati Shafaie, F., Matin Homaei, H., & Zoodfekr, L. "Comparison the Frequency of Menstrual Disorders (Amenorrhea, Oligomenorrhea, Dysmenorrhea and Premenstrual Syndrome) between Athletes and Non-Athletes Female Students of Tabriz Universities, Tabriz, Iran", The Iranian Journal of Obstetrics, Gynecology and Infertility, 16, 51, 2013, 14-21. doi: 10.22038/ijogi.2013.844