1. Department of Respiratory Medicine, Sixth Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China;
2. Department of Radiology, Sixth Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China;
3. Intense Care Unit, First Affiliated Hospital of Lishui University, Lishui, Zhejiang, China;
4. Department of Respiratory Medicine, First Affiliated Hospital of Lishui University, Lishui, Zhejiang, China