- Correspondence to Dr Xiaonan Zhang, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China; ; Professor Zhenghong Yuan; ; Professor Zhanqing Zhang;
- Received January 15, 2020
- Revised March 10, 2020
- Accepted April 13, 2020
- First published May 13, 2020.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.