1. Center of Clinical Oncology, Second People's Hospital, Lianyungang, Jiangsu 222000, P.R. China
2. Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
3. Department of Neurosurgery, Lianyungang Hospital, Affiliated to Xuzhou Medical University, Lianyungang, Jiangsu 222002, P.R. China