1. Department of Neurological Surgery, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, OH, USA;
2. Department of Neurological Surgery, Ain Shams University, Cairo, Egypt;
3. Department of Internal Medicine – Division of Endocrinology, Diabetes and Metabolism, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, OH, USA;
4. Department of Pathology, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, OH, USA;
5. Department of Otolaryngology – Head and Neck Surgery, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, OH, USA