1. Department of Cardiovascular Medicine, Xiangya Hospital Central South University Changsha Hunan China
2. Aging Institute University of Pittsburgh Pittsburgh Pennsylvania USA
3. Department of Medicine, Xiangya School of Medicine Central South University Changsha Hunan China
4. Center for Pulmonary Vascular Biology and Medicine, Pittsburgh Heart, Lung, Blood, and Vascular Medicine Institute University of Pittsburgh School of Medicine and University of Pittsburgh Medical Center Pennsylvania Pittsburgh USA
5. UPMC Vascular Laboratories University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
6. Department of Periodontology University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
7. Department of Medicine, Division of Cardiology University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA