Ki Hoon Ahn, Kyong Wook Yi, Hyun Tae Park, Jung Ho Shin, Jun Young Hur, Young Tae Kim, Sun Haeng Kim, Kyu Wan Lee, Chun Sik Bae, Tak Kim

Korean J Obstet Gynecol.2010;53(4):354-359.   Published online 2010 April 30     DOI: http://dx.doi.org/10.5468/kjog.2010.53.4.354