1. Cancer Center, Institute of Surgical Research, Daping Hospital, Third Military Medical University, Chongqing 400042, P.R. China
2. Department of Oncology, Wuhan General Hospital of Guangzhou Command, People's Liberation Army, Wuhan, Hubei 430070, P.R. China
3. Department of Pathology, Institute of Surgical Research, Daping Hospital, Third Military Medical University, Chongqing 400042, P.R. China