1. Jagiellonian University Medical College, Student’s Scientific Group of Pediatric Surgery, Kraków, Poland, Jagiellonian University Medical College, Department of Pediatric Surgery, University Children’s Hospital, Kraków, Poland
2. Jagiellonian University Medical College, Student’s Scientific Group of Pediatric Surgery, Kraków, Poland
3. Jagiellonian University Medical College, Department of Pediatric Surgery, University Children’s Hospital, Kraków, Poland