1Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou, China;
2The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China;
3Medical College of PLA, Chinese PLA General Hospital, Beijing, China;
4Department of Respiratory Medicine, The Eighth Medical Center of PLA General Hospital, Beijing, China;
5Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China;
6Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China;
7Department of Respiratory Medicine, The Second Medical Center and National Clinical Research Center for Geriatric Diseases, Medical College of PLA, Chinese PLA General Hospital, Beijing, China;
8Department of Ultrasound, Binzhou Medical University Hospital, Binzhou, China;
9Department of Critical Care Medicine, Shandong Provincial Third Hospital, Jinan, China;
10Department of Gastrointestinal Surgery, Binzhou Medical University Hospital, Binzhou, China;
11Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Correspondence: Lei Tu, MD, PhD. E-mail: [email protected]. Qinyong Hu, MD. E-mail: [email protected]. Guogang Xu, MD, PhD. E-mail: [email protected].