Funding for this research was provided by:
International Cooperation and Exchange Programme (81720108003)
National Natural Science Foundation of China (8170026)
Text and Data Mining valid from 2020-04-15
Received: 24 October 2019
Accepted: 24 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Research was approved by the Xinhua Hospital Ethics Committee affiliated to Shanghai Jiaotong University School of Medicine (XHEC-C-2017-105). All parents were informed of the purpose and significance of the experiment and signed an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.