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Sung, Su Jin, Seung Mi Lee, Sunmin Kim, Byoung Jae Kim, Chan-Wook Park, Joong Shin Park, and Jong Kwan Jun. "The Risk of Spontaneous Preterm Birth According to Maternal Pre-pregnancy Body Mass Index in Twin Gestations." J Korean Med Sci 2018.

Sung, Su Jin, et al. "The Risk of Spontaneous Preterm Birth According to Maternal Pre-pregnancy Body Mass Index in Twin Gestations." J Korean Med Sci 2018.