1. Department I—General Pediatrics, Hematology and Oncology, University Hospital Tuebingen—Children's Hospital Tuebingen, Tuebingen, Germany.
2. Department of Orthopedic Surgery, Städtisches Klinikum Dresden, Dresden, Germany.
3. Department of Orthopedics, University Hospital Tuebingen, Tuebingen, Germany.
4. Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Tuebingen, Germany.
5. Charité - Universitätsmedizin Berlin, Campus Berlin Buch, Experimental and Clinical Research Center, Zellkulturlabor für Klinische Prüfung ZKP, Berlin, Germany.