Funding for this research was provided by:
National Natural Science Foundation of China (81371911)
Beijing Science and Technology Planning Project (2010B80)
Received: 24 July 2019
Accepted: 12 May 2020
First Online: 6 June 2020
Ethics approval and consent to participate
: We have obtained written consent from all patients and their legal guardians and the study was agreed by the ethics committee of the PLA General Hospital (Beijing, China).
: The written informed consents were obtained from all patients to use their data and accompanying images for publication.
: The authors declare that they have no competing interests.