1. Department of Neurosurgery; Mayo Clinic; 4500 San Pablo Rd Jacksonville FL 32224 USA
2. Department of Orthopaedic Surgery; Zhongshan Hospital; Fudan University; No. 180 Fenglin Rd Shanghai 200032 China
3. Department of Chemical and Biomolecular Engineering; Ohio State University; 151 W. Woodruff Ave. Columbus OH 43210 USA
4. Department of Neurosurgery; West China Hospital; No. 37th Guoxue Xiang Chengdu Sichuan 610041 China
5. Department of Radiation Oncology; University of Texas Southwestern Medical Center; 2280 Inwood Rd Dallas TX 75390 USA