1. Department of Poisoning and Occupational Diseases, Emergency Medicine, Qilu Hospital of Shandong University, Jinan, China
2. Department of Digestive Internal Medicine, Qilu Hospital of Shandong University, Cheeloo College of Medicine, Shandong University, Jinan, China
3. School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, China
4. Department of Geriatric Medicine, Qilu Hospital of Shandong University, Cheeloo College of Medicine, Shandong University, Jinan, China