Nayoon Park, Minji Ryu, Geumjoon Cho, Min-Jeong Oh, Hai-Joong Kim, Tak Kim, Sun Haeng Kim, Soon-Cheol Hong

Korean J Obstet Gynecol.2012;55(9):664-668.   Published online 2012 September 17     DOI: http://dx.doi.org/10.5468/KJOG.2012.55.9.664