1. Department of Anesthesiology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, P.R. China
2. Laboratory Animal Research Center/Institute of Comparative Medicine, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
3. Department of Ultrasound, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, P.R. China