1. Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China
2. National Institution of Drug Clinical Trial, Xiangya Hospital, Central South University, Changsha, Hunan, P.R.China
3. Department of Cardiovascular Medicine, Xiangya Hospital, Central South university, Changsha, Hunan, P.R.China
4. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, P.R. China