Funding for this research was provided by:
Guangzhou Science, Technology and Innovation Commission (201804010120)
Natural Science Foundation of Guangdong Province (2018A030310056)
Text and Data Mining valid from 2019-08-14
Received: 3 January 2019
Accepted: 7 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This research was carried out according to the principles of the Declaration of Helsinki and was approved by the Ethics Committees of Guangdong Women and Children Hospital. The parents/guardians provided verbal consent to participate as approved by the ethics committee and no animal work was carried out as part of this study.
: Not applicable.
: The authors declare that they have no competing interests.