Funding for this research was provided by:
National Natural Science Foundation of China (81870710)
Text and Data Mining valid from 2018-12-10
Received: 5 October 2018
Accepted: 1 December 2018
First Online: 10 December 2018
Compliance with ethical standards
: No conflict of interest exists in the submission of this manuscript.
: Ethical approval was obtained from the ethics committee of Eye, Ear, Nose and Throat Hospital of Fudan University (2017061).
: Informed consent was obtained from all individual participants included in the study.