Article History
Received: 6 June 2019
Accepted: 4 September 2019
First Online: 18 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest relevant to this manuscript.
: This study was approved by the ethics committee of Union Hospital, Tongji Medical College, Huazhong University of Science and Technology. Written consent from the patient was waived, because of entirely anonymized images from which the individual cannot be identified.