Funding for this research was provided by:
Major Science and Technology & Key Social Development Projects of Zhejiang Science and Technology Department (2014C03047-1)
Article History
Received: 30 October 2018
Accepted: 13 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Zhejiang Provincial People’s Hospital. The need for individual consent was waived by the committee because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.