1. Department of Infectious Diseases, the First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan Province 421001, China
2. Department of Medical Oncology, the First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan Province 421001, China
3. Department of Pathology, the First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan Province 421001, China