1. Department of Pediatric Cardiology, Faculty of Medicine, Zonguldak Karaelmas University, 67600 Zonguldak, Turkey
2. Department of Pediatric Cardiology, Faculty of Medicine, Gazi University, 06500 Ankara, Turkey
3. Department of Pediatric Gastroenterology, Ankara Diskapi Children's Hospital, 06110 Ankara, Turkey
4. Department of Pediatric Cardiology, Ankara Diskapi Children's Hospital, 06110 Ankara, Turkey
5. Department of Biostatistics and Medıcal Informatics, Faculty of Medicine, Akdeniz University, 07059 Antalya, Turkey
6. Department of Pediatric Gastroenterology, Faculty of Medicine, Zonguldak Karaelmas University, 67600 Zonguldak, Turkey