Hee Suk Lee, Joo Myung Kim, Soo Yoon Lee, Jang Hwan Woo, Yeon Jean Cho, Kwan Young Joo, Kyo Hong Choi

Korean J Obstet Gynecol.2012;55(3):166-171.   Published online 2012 March 15     DOI: http://dx.doi.org/10.5468/KJOG.2012.55.3.166