1. School of Clinical Medicine, Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
2. Laboratory of Pathology, Key Laboratory of Transplant Engineering and Immunology, NHFPC, West China Hospital, Chengdu, Sichuan 610000, P.R. China
3. Department of Pathology, The First People's Hospital of Yibin, Yibin, Sichuan 644000, P.R. China