Received: 8 December 2020
Accepted: 18 May 2021
First Online: 8 June 2021
: The study was approved by the Ethics Committee of the Affiliated Eye Hospital of Wenzhou Medical University. It was performed according to the tenets of the Declaration of Helsinki for research involving human subjects. Written informed consent was obtained directly from the participants or from the parents or legal guardians of participants younger than 18 years.
: Not applicable.
: The authors declare that they have no competing interests.z