Funding for this research was provided by:
National Natural Science Foundation of China (51573207)
Ningbo Natural Science Foundation (2016A610006)
Received: 11 June 2019
Accepted: 24 October 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: The CT data used in this study were approved by the participants.
: Not applicable
: The authors declare that they have no competing interests.