Funding for this research was provided by:
Medical Health Science and Technology Project of Zhejiang Provincial Health Commissio
Received: 20 August 2020
Accepted: 17 November 2020
First Online: 22 November 2020
Ethics approval and consent to participate
: This cross-sectional study protocol obtained approval from the Ethics Committee of the Second Affiliated Hospital of Wenzhou Medical University (No. L-2020-21). All children’s parents provided informed consent.
: Not applicable.
: The authors declare that they have no competing interests.