Wang, Hai
Li, Tao
Yuan, Wangshu
Zhang, Zheping
Wei, Jing
Qiu, Guixing
Shen, Jianxiong
Article History
Received: 17 October 2018
Accepted: 26 April 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Peking Union Medical College Hospital. All the participants were orally informed, and the parents gave their written consent.
: Not applicable.
: The authors declare that they have no competing interests.
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