Yang, Xiaobo http://orcid.org/0000-0002-1098-3165
Article History
Received: 30 January 2019
Accepted: 19 February 2019
First Online: 27 February 2019
Compliance with ethical standards
:
: The author declares no competing interests.
: 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 anonymised images from which the individual cannot be identified.