1. Department of First Internal Medicine, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China
2. Department of Internal Medicine, Harbin Red Cross Central Hospital, Harbin, Heilongjiang, China
3. Department of Sixth Internal Medicine, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China
4. Department of Internal Medicine, The First Hospital of Harbin, Harbin, Heilongjiang, China