Received: 1 April 2019
Accepted: 26 May 2019
First Online: 11 June 2019
Compliance with ethical standards
: The authors declare that they have no competing interests.
: All individuals were informed about the purposes of the study and have signed their consent for publishing the data.
: All the patient investigations conformed to the principles outlined in the Declaration of Helsinki and have been performed with the permission EENT2015011 released by the responsible Ethic’s Committee of Eye & ENT Hospital of Fudan University. All the patients were informed about the purposes of the study and have signed their “consent of the patient.” This article does not contain any studies with animals performed by any of the authors.