1. Hospital of Stomatology, Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
2. Department of Haematology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
3. Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China