1. Department of Clinical Medicine, The Affiliated Second Hospital, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
2. Departments of Immunology and Etiology, Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
3. Department of Maxillofacial Surgery, Stomatological College, Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
4. Department of Biochemistry and Cell and Molecular Biology, Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
5. Department of Gastroenterology, The First Affiliated Hospital, Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
6. Department of Clinical Laboratory, The First Affiliated Hospital, Jiamusi University, Jiamusi, Heilongjiang 154002, P.R. China
7. Department of Rehabilitation Medicine, Rehabilitation Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
8. Department of Physiology, Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China
9. Department of Human Anatomy, Basic Medical College, Jiamusi University, Jiamusi, Heilongjiang 154007, P.R. China