¹Department of Respiratory Medicine, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Medical College of PLA, Chinese PLA General Hospital, Beijing, China;

²Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, China;

³Department of Ultrasound, Binzhou Medical University Hospital, Binzhou, China;

⁴The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing, China;

⁵Department of Respiratory and Critical Care Medicine, Binzhou Medical University Hospital, Binzhou, China;

⁶Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.

Correspondence: Lei Tu, MD, PhD. E-mail: [email protected]. Lei Pan, MD, PhD. E-mail: [email protected]. Guogang Xu, MD, PhD. E-mail: [email protected]. Hongxia Li, MD. E-mail: [email protected].

SUPPLEMENTARY MATERIAL accompanies this paper at http://links.lww.com/AJG/B809