Funding for this research was provided by:
National Outstanding Youth Science Fund Project of National Natural Science Foundation of China (81830026)
Natural Science Foundation of Tianjin City (18ZXDBSY00030)
Received: 3 April 2020
Accepted: 12 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: This study was in accordance with the tenets of the Helsinki Declaration and was approved by the Shanxi Eye Hospital Ethics Committee. The requirement for informed consent was waived due to the retrospective nature of this study.
: Not applicable.
: The authors declare no conflict of interest.