1. Faculty of Medicine, Department of Pediatric Gastroenterology, Hepatology and Nutrition, Bulent Ecevit University, Zonguldak, Turkey
2. Faculty of Medicine, Department of Pediatrics, Bulent Ecevit University, Zonguldak, Turkey
3. Faculty of Medicine, Department of Biostatistics, Bulent Ecevit University, Zonguldak, Turkey