Funding for this research was provided by:
Chongqing Medical University (201407, X3437)
Received: 22 August 2018
Accepted: 18 December 2018
First Online: 18 January 2019
Ethics approval and consent to participate
: The ethics committee of the Children’s Hospital of Chongqing Medical University, Chongqing, China approved this retrospective study. Because this was a retrospective study, written informed consents were not obtained (The need for consent was waived by the ethics committee of the Children’s Hospital of Chongqing Medical University, Chongqing, China). All patients’ records/information was anonymized and de-identified prior to analysis.
: Not applicable.
: The authors declare that they have no competing interests.
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