1. A. Getlik Clinic for Children and Adolescents SMU and UHB, Slovak Medical University in Bratislava, Bratislava, SLOVAK REPUBLIC
2. Department of Anesthesiology and Intensive Care, National Pirogov Memorial Medical University, Vinnytsya, UKRAINE
3. 2nd Surgical Clinic of the Medical Faculty of Comenius University, Bratislava, SLOVAK REPUBLIC
4. Department of Pediatric Surgery, Slovak Medical University in Bratislava, Bratislava, SLOVAK REPUBLIC