Funding for this research was provided by:
Hangzhou Science and Technology Bureau (20100733Q09)
Natural Science Foundation of Zhejiang Province (LY15C070001)
Science and Technology Department of Zhejiang Province (2013C33093)
Text and Data Mining valid from 2019-04-11
Received: 4 December 2018
Accepted: 6 April 2019
First Online: 11 April 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: The study was approved by the hospital ethical committee.
: Informed consent was obtained for the study of medical records.