1. Department of Laboratory Medicine, Research Center on Aging and Medicine, Fudan University, Shanghai, China
2. Department of Laboratory Medicine, Shanghai Key Laboratory of Clinical Geriatric Medicine, Shanghai, China
3. Department of Laboratory Medicine, Huadong Hospital, Fudan University, Shanghai, China
4. Department of Endoscopy, Huadong Hospital, Fudan University, Shanghai, China
5. Unit for Laboratory Animal Medicine, Department of Microbiology and Immunology, And Center for Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, USA
6. Department of Gastroenterology, Gerontology Institute of Shanghai, Huadong Hospital, Fudan University, Shanghai, China
7. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan and Research Service, VA Ann Arbor Healthcare System, Ann Arbor, USA