CJCP     2022 24 (5):  514-520    ISSN: 1008-8830  CN: 43-1301/R Sex differences in clinical outcomes of extremely preterm infants/extremely low birth weight infants: a propensity score matching study SU Zhi-Wen, LIN Li-Li, SHI Bi-Jun, HUANG Xiao-Xia, WEI Jian-Wei, JIA Chun-Hong, WU Fan, CUI Qi-Liang Department of Pediatrics, Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, China (Lin L-L, Email: lilylin7@163.com) Received: 2022-01-14  Revised: null  Online: null Supporting info