Wang, Zheng-Li
Liu, Li
Hu, Xiao-Yu
Guo, Lu
Li, Qiu-Yu
An, Yao
Jiang, Ya-Jun
Chen, Shi
Wang, Xue-Qiu
He, Yu
Li, Lu-Quan
Article History
Received: 7 February 2019
Accepted: 29 April 2019
First Online: 8 June 2019
Ethics approval and consent to participate
: This study was carried out in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Children’s Hospital of Chongqing Medical University. The study was a retrospective matched cohort study. Considering the anonymized nature of the data and scientific purpose of this study, the requirements for informed consent were waived by the Ethics Committee of Children’s Hospital of Chongqing Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
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