- Correspondence to Dr Junfeng Du, Department of Respiratory and Critical Care Medicine, Cangzhou Central Hospital, Cangzhou City 061000, Hebei, China;
- Accepted May 11, 2021
- First published June 14, 2021.
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.