1 Department of Pulmonary and Critical Care Medicine, The Affiliated Hospital of Kunming University of Science and Technology, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; Medical School, Kunming University of Science and Technology, Kunming, Yunnan, China.
2 Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, China.
3 Department of Pulmonary and Critical Care Medicine, The Affiliated Hospital of Kunming University of Science and Technology, The First People's Hospital of Yunnan Province, Kunming, Yunnan, China; Department of Pulmonary and Critical Care Medicine, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong, China. Electronic address: [email protected].