1. Health Management Institute of Chinese PLA General Hospital, Beijing, People's Republic of China
2. Department of Transfusion Medicine, The Second Artillery General Hospital of Chinese People's Liberation Army, Beijing, People's Republic of China
3. Geriatrics Institute of Xiyuan Hospital, Academy of Chinese Medical Sciences, Beijing, People's Republic of China
4. Department of Biotherapy of PLA 455 Hospital, Shanghai, People's Republic of China
5. Galactophore Department of the First Affiliated Hospital of Zhengzhou University, Henan, People's Republic of China
6. Beijing Key Laboratory of Normal Aging and Geriatrics, Geriatrics Institute of Chinese PLA General Hospital, Beijing, People's Republic of China