Funding for this research was provided by:
National Key Clinical Specialty Discipline Construction Program of China (NA)
National Science Foundation of China (81871485)
Received: 25 June 2019
Accepted: 22 November 2019
First Online: 4 December 2019
Ethics approval and consent to participate
: This study was approved by our institutional ethics committee.
: Written informed consent was waived from each patient due to this retrospective study.
: The authors declare that they have no conflict of interest.