1. Department of Paediatric Surgery and Paediatric Urology, Centre of Postgraduate Medical Education, Warsaw, Poland
2. Department of Diagnostic Imaging, Independent Public Complex of Healthcare Facilities ‘Dzieci Warszawy’ in Dziekanów Leśny, Dziekanów Leśny, Poland
3. Department of Gastroenterology, Hepatology, Eating Disorders and Paediatrics, The Children’s Memorial Health Institute, Warsaw, Poland