Funding for this research was provided by:
National Major Science and Technology Projects of China (2017ZX10103008-005)
Huzhou Municipal Science and Technology Bureau (2018GYB62)
Received: 4 April 2020
Accepted: 2 July 2020
First Online: 1 August 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Huzhou Central Hospital (Approval No. 20140626) and signed informed consent was obtained from the parents or legal guardians of children under 14 years old.
: Not applicable.
: The authors declare that they have no competing interests.