1. Department of Gastroenterology, The Eighth Affiliated Hospital of Guangxi Medical University, Guigang, Guangxi 537100, P.R. China
2. Department of Respiratory and Critical Care Medicine, The Eighth Affiliated Hospital of Guangxi Medical University, Guigang, Guangxi 537100, P.R. China
3. Department of Intensive Care Unit, The Eighth Affiliated Hospital of Guangxi Medical University, Guigang, Guangxi 537100, P.R. China