1. Department of Oncology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, Shandong 266003, P.R. China
2. Department of Oncology, The Sixth People's Hospital, Medical College of Shanghai Jiao Tong University, Shanghai 200233, P.R. China
3. Department of Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China
4. Central Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China
5. Department of Radiotherapy, Yantai Yuhuangding Hospital Affiliated to Medical College of Qingdao University, Yantai, Shandong 264000, P.R. China
6. Department of Oncology, Yantai Yuhuangding Hospital Affiliated to Medical College of Qingdao University, Yantai, Shandong 264000, P.R. China