1 Department of Respiratory Medicine, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Medical College of PLA, Chinese PLA General Hospital, Beijing, China.
2 Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China.
3 Department of Ultrasound, Binzhou Medical University Hospital, Binzhou, China.
4 The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China.
5 Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou, China.
6 Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.