CJCP     2015 17 (5):  445-448    ISSN: 1008-8830  CN: 43-1301/R Expression profile of TGF-β1 and BMP-7 in serum of preterm infants with respiratory distress syndrome LI Xiao-Qing, ZHENG Ling-Fang Department of Neonatology, Second Affiliated Hospital of Xi'an Medical College, Xi'an 037008, China Received: 2014-08-20  Revised: 2014-11-07  Online: null Supporting info null