Back Kyoung Seo, Jin Hoon Chung, Jae Hyug Yang, Joong Sik Shin, Moon Young Kim, Hyun Mee Ryu, Min Ji Kim, Hyun Jung Lee, Young Yu, June Seek Choi, Min Hyoung Kim, Yeon Kyung Cho, Kyu Hong Choi
Korean J Obstet Gynecol. 2006;49(6):1204-1211. Published online June 1, 2006