1. Department of Internal Medicine, College of Medicine and Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
2. Division of Endocrinology, Department of Internal Medicine, College of Medicine and Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
3. Department of Clinical Oncology, College of Medicine and Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
4. Department of Otolaryngology, Head and Neck Surgery, Saint Paul Millenium Medical College, Addis Ababa, Ethiopia