1. Department of Surgery, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P. R. China
2. Key Laboratory of Cancer Prevention and Intervention, China National Ministry of Education, Cancer Institute, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P. R. China
3. Department of Oncosurgery, Anyang Tumor Hospital, Henan, P. R. China
4. Department of Pathology, Anyang Tumor Hospital, Henan, P. R. China