345 - Mortality and Morbidity in Extremely Preterm Twins with Birth Weight Discrepancies: A Nationwide Cohort Study from Japan

Chi-Nien Chen, National Taiwan University Hospital Hsinchu Branch, Hsinchu, Hsinchu, Taiwan (Republic of China); Yasuhisa Ikuta, National Center for Child Health and Development, Okura, Setagaya-ku, Tokyo, Japan; Hidehiko Maruyama, National Center for Child Health and Development, Setagaya, Tokyo, Japan; Masayo Kokubo, Nagano Children's Hospital, Azumino, Nagano, Japan; Hidehiko Nakanishi, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan; Shinya Hirano, Osaka Women's and Children's Hospital, Izumi, Osaka, Japan; Po-Nien Tsao, National Taiwan Univsersity Hospital, Taipei, Taipei, Taiwan (Republic of China); Yushi Ito, National Center for Child Health and Development, Tokyo, Tokyo, Japan; Satoshi Kusuda, Neonatal Research Network of Japan, Taito, Tokyo, Japan; Tetsuya Isayama, National Center for Child Health and Development, Setagaya-ku, Tokyo, Japan