Comparative Effectiveness of Two Fraction of Inspired Oxygen Thresholds for Surfactant Administration in Very Preterm Infants with Respiratory Distress Syndrome: a target trial emulation cohort study

Run Yang, Jiangxi Maternal and Child Health Hospital, Nanchang, Jiangxi, China (People's Republic); Jie yang, Fudan Children's Hospital, Shanghai, Shanghai, China (People's Republic); Liang Gao, Women and Children’s Hospital, School of Medicine, Xiamen university, Xiamen, Fujian, China (People's Republic); Shibin Tu, Jiangxi Maternal and Child Hospital, Nanchang, Jiangxi, China (People's Republic); Wenyan Tang, Jiangxi Maternal and Child Hospital, Nanchang, Jiangxi, China (People's Republic); Lin Yuan, Children's Hospital of Fudan University, Shanghai, Shanghai, China (People's Republic); Kaizhen Liu, Children's Hospital of Chongqing Medical University, Chongqing, Chongqing, China (People's Republic)