Xiaohong Liu1, Wei Yang1, Miaoqiong Situ1, Zhiying Li1*
1 Department of Paediatrics, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, 510080, P.R.China
*Correspondence should be addressed to Zhiying Li (lzy1802@126.com)
Received date: December 2, 2014; Accepted date: February 23, 2015; Published date: May 2, 2015
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