Rattanachalyanont M, Chearskul S. Abnormal Menstrual Cycle in Second Year Medical Students at Siriraj Hospital. Thai J Obstet Gynaecol [internet]. 1996 Dec. 1 [cited 2026 Sep. 29];8(4):319-23. available from: https://he02.tci-thaijo.org/index.php/tjog/article/view/92552