1. Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio
2. Department of Neurologic Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio
3. Department of Neurologic Surgery, Ain Shams University, Cairo, Egypt
4. College of Nursing, The Ohio State University, Columbus, Ohio
5. Department of Otolaryngology - Head and Neck Surgery, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, Ohio
6. Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio