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Article History

Received: 15 June 2018

Accepted: 14 November 2018

First Online: 20 November 2018

Ethics approval and consent to participate

: The medical ethics committee of Guangzhou First People’s Hospital approved this study, with the following reference number: K-2018-059-03. The patient-related data collected in this study include the following: name, age, and clinical diagnosis. The names were replaced by numbers, and the relevant data of the patient was encrypted and stored in the main study. We had obtained the written informed consent of the parents of the children.

: Not applicable.

: The authors declare that they have no competing interests.

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