1. Department of Gerontology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, No. 600, Shanghai, P R China;
2. Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, and Vascular Surgery Research, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, USA;
3. Department of Gerontology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China, P R China;
4. Department of Cardiology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, No. 600, Shanghai, P R China;
5. Department of Priority Ward, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, No. 600, Shanghai, P R China