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Woo Young Hyun, Jong Pyo Lee, Keun Jai Yoo, Kye Hyun Kim, In Ok Song, Hye Jung Yeon, Eun Chan Paik, Mi Kyoung Koong, Il Pyo Son, Jong Young Jun, Inn Soo Kang
Korean J Obstet Gynecol. 1997;40(8):1602-1607. Published online January 1, 2001