Funding for this research was provided by:
1.National Natural Science Foundation of China (81570879)
2.National Natural Science Foundation of China for Young Scholars (81600762)
Received: 9 October 2017
Accepted: 8 February 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Eye and ENT Hospital, Fudan University, and was carried out with due regard to the tenets of the Declaration of Helsinki. After a detailed explanation of the study, written informed consent was obtained from all the participants’ legal agents.
: Not applicable.
: The authors declare that they have no competing interests
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