1. Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
2. Department of Radiation Oncology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, United States
3. Department of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, United States
4. Department of Neurological Surgery, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, United States
5. Department of Otolaryngology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, United States