1. The Second Clinical Medical School, Nanjing Medical University, Nanjing, Jiangsu 210011, P.R. China
2. The First Clinical Medical School, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
3. Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu 210000, P.R. China