1 Center for Spinal- and Neurosurgery, Berufsgenossenschaftliche Unfallklinik Frankfurt am Main, Germany.
2 Department of Orthopaedic Surgery, Sidney Kimmel Medical Center of Thomas Jefferson University, Delaware Valley Spinal Cord Injury Center, Philadelphia, USA.
3 Spinal Surgery University Medical Center Utrecht, International Medical Center Acibadem, Amsterdam, Netherlands.
4 Interdisziplinäres Zentrum f. Wirbelsäulen- und Skoliosetherapie, Malteser Waldkrankenhaus St. Marien, Erlangen, Germany.