1. Peking University Fifth School of Clinical Medicine, National Center for Clinical Laboratories, National Center of Gerontology, Beijing Hospital, Beijing, China;
2. National Center for Clinical Laboratories, National Center of Gerontology, Beijing Hospital, Beijing, China;
3. Beijing Engineering Research Center of Laboratory Medicine, Beijing Hospital, Beijing, China;
4. Graduate School, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China