1. Department of Pathology and Forensic Medicine, College of Basic Medical Science, Dalian Medical University, Dalian, Liaoning 116044, P.R. China
2. Department of Pathology, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang 310000, P.R. China
3. Department of Oncology, Qingdao Municipal Hospital, Qingdao, Shandong 266071, P.R. China