CJCP     2013 15 (8):  703-707    ISSN: 1008-8830  CN: 43-1301/R Advances in medical care for extremely low birth weight infants worldwide CHEN Chun, ZHANG Qian-Shen Neonatal Intensive Care Unit, Shenzhen Maternity & Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong 518028, China. zhangqianshen2005@163.com Received: null  Revised: null  Online: null Supporting info