He, Yuan
,
Li, Shi-Ming
Kang, Meng-Tian
Liu, Luo-Ru
Li, He
Wei, Shi-Fei
Ran, An-Ran
Wang, Ningli
Article History
Received: 10 September 2017
Accepted: 25 May 2018
First Online: 4 June 2018
Ethics approval and consent to participate
: Ethics approval was obtained from the institutional review board of Beijing Tongren Hospital, Capital Medical University, and followed the tenets of the declaration of Helsinki. Informed written consent was obtained from at least one parent. Verbal assent was obtained from each child.
: All of the authors declare that they have no competing interests.
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