Funding for this research was provided by:
National Natural Science Foundation of China (81125009)
The research foundation for distinguished scholar of Zhejiang University (188020-193810101/089)
Received: 22 June 2019
Accepted: 10 September 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The ethics committee of Second Affiliated Hospital, Zhejiang University School of Medicine in Hangzhou, China approved this study. Each participant gave an informed written consent before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.