1. Department of Oncology, Liyang People's Hospital, Liyang, Jiangsu 213300, P.R. China
2. Department of Oncology, Affiliated Cancer Hospital of Nantong University, Nantong, Jiangsu 226002, P.R. China
3. Department of Oncology, The Second People's Hospital of Nantong, Nantong, Jiangsu 226002, P.R. China
4. Department of Pathogenic Biology, Medical College, Nantong University, Nantong, Jiangsu 226002, P.R. China