1. Mayo Clinic School of Medicine, Mayo Clinic, Rochester, Minnesota, USA
2. Department of Otolaryngology–Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, USA
3. Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
4. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA
5. Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA