1. Department of Anesthesiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Jinan, Shandong, China
2. Department of Gastroenterology, The Affiliated Hospital of Weifang Medical University, Weifang, Shandong, China
3. Department of Physiology of Basic Medicine College, Guizhou Medical University, Guiyang, Guizhou, China
4. Department of Anesthesiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China