Hye-Weon Park, Min-Young Lee, Jea-Ra Lee, You-Jung Han, Si-Won Lee, Jin-Hoon Chung, Hyun-Kyong Ahn, Jung-Yeol Han, Hyun-Mee Ryu, Moon-Young Kim, Jae-Hyug Yang, Min-Hyoung Kim

Korean J Obstet Gynecol.2012;55(10):693-698.   Published online 2012 October 10     DOI: http://dx.doi.org/10.5468/KJOG.2012.55.10.693