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Objective: The aim of the study were to determine the incidence and possible risk factors associated with retinopathy of prematurity(ROP),and explore the impact of pulmonary surfactant Curosurf and Nasal Continuous Positive Airway Pressure(NCPAP)on the development of ROP in Tianjin,China.Methods: A multicenter retrospective review was undertaken of the records of 2492 preterm infants in several hospitals of Tianjin,during the period 2008-2013.Data were extracted and analysed only in those patients who were born on 37 or less weeks of gestational age.