1. Department of Pathology, The Second Affiliated Hospital of Harbin Medical University, Heilongjiang. China
2. Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University. Harbin Institute of Technology, Heilongjiang Provincial Hospital, Heilongjiang, China
3. Department of Pathology, Harbin Medical University Cancer Hospital, Heilongjiang, China
4. Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Heilongjiang, China