1. Geriatrics Digestion Department of Internal Medicine; The First Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
2. Guangxi Key Laboratory of AIDS Prevention and Treatment & Guangxi Universities Key Laboratory of Prevention and Control of Highly Prevalent Disease; School of Public Health; Guangxi Medical University; Nanning Guangxi China
3. Guangxi Collaborative Innovation Center for Biomedicine; Life Sciences Institute; Guangxi Medical University; Nanning Guangxi China
4. Department of Pathology and Laboratory Medicine; Temple University School of Medicine; Philadelphia Pennsylvania