Perinatal characteristics and neonatal outcomes of singletons and twins in Chinese very preterm infants: a cohort study by Min Yang, Lingyu Fang, Yanchen Wang, Xiaoying Li, Yun Cao, Jianhua Sun, Joseph Ting, Xiafang Chen, Xiaobo Fan, Jiale Dai, Xiaomei Tong, Dongmei Chen, Jimei Wang, the Chinese Neonatal Network

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