Yong-Hwa Chae, Yun-Young Kim, Gye-Hyeong An, Jang-Hwan Woo, Jin-Hoon Chung, June-Seek Choi, Hyun-Mee Ryu, Moon-Young Kim, Jae-Hyug Yang, Min-Hyoung Kim

Korean J Obstet Gynecol.2010;53(9):769-777.   Published online 2010 September 30     DOI: http://dx.doi.org/10.5468/kjog.2010.53.9.769