1. Department of Neurosurgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061 P.R. China
2. Department of Ophthalmology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061 P.R. China
3. Department of Otorhinolaryngology‑Head and Neck Surgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061 P.R. China
4. Positron Emission Tomography/Computed Tomography Center, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061 P.R. China