1. Department of Physiology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
2. Institute of Forensic Sciences, Soochow University, Suzhou, Jiangsu 215123, P.R. China
3. Department of Cardiology, The Second Affiliated Hospital, Xi'an Medical University, Xi'an, Shaanxi 710038, P.R. China
4. Central Laboratory, Xi'an International Medical Center Hospital, Xi'an, Shaanxi 710100, P.R. China