Funding for this research was provided by:
National Natural Science Foundation of China (No. 81574032)
Basic research on the application of independent innovation plan in Qingdao (No. 15-9-1-59-jch)
Received: 2 September 2018
Accepted: 11 February 2019
First Online: 7 March 2019
Ethics approval and consent to participate
: All the clinical specimens were collected in accordance to the Declaration of Helsinki. This study was approved by the Research Ethics Committee of the Eye Hospital of the China Academy of Chinese Medical Sciences (EHCAC-20170635, date: 2017-6-12).
: Not applicable.
: The authors declare that they have no competing interests.
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