1. Paediatric Orthopaedics and Traumatology Department, Children’s Hospital, Medical University of Warsaw, 02-091 Warsaw, Poland
2. Nałęcz Institute of Biocybernetics and Biomedical Engineering Polish Academy of Sciences, 02-109 Warsaw, Poland
3. Department of Orthopedics, Medical Centre of Postgraduate Education, 01-813 Warsaw, Poland
4. Gruca Teaching Hospital, 05-400 Otwock, Poland
5. Mazovia Regional Hospital in Siedlce, 08-110 Siedlce, Poland