1. Department of Anesthesiology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310013, P.R. China
2. Department of Neurology, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang 310012, P.R. China
3. Key Laboratory of Digestive Pathophysiology of Zhejiang Province, Zhejiang Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, P.R. China