Funding for this research was provided by:
the Health and Family Planning Commission of Kunming and Yunnan (2016-SW (Sheng)-30, and 2017-SW(Yang)-02)
Text and Data Mining valid from 2019-11-14
Received: 10 February 2019
Accepted: 3 October 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: The present study was approved by the ethics committee of the Children’s Hospital, Kunming Medical University; written informed consent was obtained from participants or their guardians.
: Written informed consent for publication of their clinical details and data was obtained from their guardians.
: The authors declare that they have no competing interests.