1. Department of Oncology, Jiujiang No. 1 People's Hospital, Jiujiang, Jiangxi 332000, P.R. China
2. Department of Pathology, Gaozhou People's Hospital, Gaozhou, Guangdong 525200, P.R. China
3. Department of Pathology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510220, P.R. China