1. Department of Radiology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston MA, USA
2. Department of Neurosurgery, Nuclear Industry 215 Hospital of Shaanxi Province, Xianyang, China
3. Radiology
4. Department of Neuroradiology, Clinical Neurocenter, University of Zurich, University Hospital of Zurich, Zurich, Switzerland
5. Department of Otology and Laryngology, Harvard Medical School, Boston, MA, USA