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Article History

Received: 11 June 2018

Accepted: 24 October 2018

First Online: 7 November 2018

Ethics approval and consent to participate

: The study was approved by the Ethics Committee at Tianjin Aier Eye Hospital. Written informed consents were obtained from all participants.

: Written informed consent was obtained from the patients for publication and any accompanying images.

: The authors declare that they have no competing interests and no financial competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.