CJCP     2018 20 (4):  261-266    ISSN: 1008-8830  CN: 43-1301/R Clinical features and prognosis of preterm infants with varying degrees of bronchopulmonary dysplasia LI Wen-Li, XU Fa-Lin, NIU Ming, LIU Meng-Di, DONG Hui-Fang Department of Neonatology, Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China Received: 2018-01-06  Revised: 2018-03-02  Online: null Supporting info