1 | Department of Surgery, Faculty of Health Sciences, Collegium Medicum, University of Warmia and Mazury in Olsztyn, Poland |
2 | Clinical Ward of Paediatric Surgery and Urology, Regional Specialist Children’s Hospital in Olsztyn, Poland |
3 | Paediatric Surgery Students’ Association, School of Medicine, Collegium Medicum, University of Warmia and Mazury in Olsztyn, Poland |