1. Department of Otolaryngology, Faculty of Medicine, Atatürk University, Erzurum, Turkey
2. Department of Paediatric Gastroenterology and Nutrition, Faculty of Medicine, Atatürk University, Erzurum, Turkey
3. Department of Paediatric Endocrinology and Metabolism, Faculty of Medicine, Atatürk University, Erzurum, Turkey