1. Department of Medical Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
2. Department of Internal Medicine, Harbin Red Cross Center Hospital, Harbin, Heilongjiang 150081, P.R. China
3. Department of Pathology, Nanjing Drum Tower Hospital, Nanjing, Jiangsu 210000, P.R. China