Funding for this research was provided by:
National Natural Science Foundation of China (No. 81741026 and No. 81571515, 81800288)
Science‐technology Support Plan Projects in Sichuan province (2019YFS0243, 2017SZ0117)
Technology Innovation Research and Development Project of Chengdu Science and Technology Bureau (No 2018-YF05-00249-SN)
Received: 16 February 2020
Accepted: 7 September 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: The study was approved by the University Ethics Committee on Human Subjects at Sichuan University. Informed written consent was obtained from the parents following a full explanation of the nature of the study.
: Not applicable.
: All authors have no conflict of interests or any grants to declare.