CJCP     2012 14 (1):  11-14    ISSN: 1008-8830  CN: 43-1301/R Diseases in the Neonatal period among preterm infants: an epidemiological investigation QI Hua-Xue, CHEN Ping-Yang, YUAN Shao-Li Department of Neonatology, Second Xiangya Hospital of Central South University, Changsha 410011, China. wycpyfu@163.com Received: null  Revised: null  Online: null Supporting info