1. Health Management Center, The First Affiliated Hospital, University of South China, Hengyang, China
2. Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, China
3. Department of Radiation Oncology, Indiana University School of Medicine, IU Simon Comprehensive Cancer Center, IN, USA
4. Department of Spine Surgery, The First Affiliated Hospital, University of South China, Hengyang, China