1. Department of Paediatric Surgery; Martin Luther University Halle-Wittenberg; Halle Germany
2. Department of Paediatrics; Martin Luther University Halle-Wittenberg; Halle Germany
3. Department of Neurology; Martin Luther University Halle-Wittenberg; Halle Germany
4. Department of Orthopaedics; Martin Luther University Halle-Wittenberg; Halle Germany