Heung Ki Kim, Woo Seok Son, Tae Chul Park, Tae Eung Kim, Young Me Koh, Ji Min Song, Ki Young Park, Jae Hoon Kim, Ki Seong Ryu, Jin Woo Kim, Sung Eun NamKoong, Soo Pyung Kim
Korean J Obstet Gynecol. 1999;42(11):2465-2473. Published online January 1, 2001