1. Department of Oncology, Beijing Shijitan Hospital of Capital Medical University, Beijing, P. R. China
2. Laboratory of Cell Engineering, Institute of Biotechnology, Beijing, P. R. China
3. Department of Vascular and Endocrine Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China, Xi'an, Shaanxi Province, P. R. China
4. Beijing Key Laboratory for Aging and Geriatrics, Institute of Geriatrics, General Hospital of Chinese PLA, Beijing, P.R.China