1. Department of Medical Oncology, The Second Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541199, P.R. China
2. Department of Medical Oncology, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
3. Department of Medical Oncology, Affiliated Langdong Hospital of Guangxi Medical University, Nanning, Guangxi 530029, P.R. China
4. Department of Surgery 1, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530001, P.R. China