1. Department of Paediatric Orthopaedics and Traumatology Poznan University of Medical Sciences PoznanPoland
2. Division of Virtual Engineering Poznan University of Technology PoznanPoland
3. Institute of Psychology University of Łódź ŁódźPoland
4. Department of Orthopaedics and Paediatric Orthopaedics Medical University of Łódź Łódź Poland