Mi Kyung Koo, Hyun Hee Kim, Sam Hyun Cho, Seung Ryong Kim, Su Hyun Jo, Kyung Tae Kim, Hyung Moon, Yoon Yoong Hwang, Kyung Hyun Kim, Jung Bae Yoo, Ki Young Ryu, Yoon Young Lee
Korean J Obstet Gynecol. 2001;44(3):460-465. Published online March 1, 2001