1. IRCCS Fondazione S Lucia, Rome, Italy
2. Berufsgenossenschaftliche Unfallklinik Murnau, Murnau, Germany
3. Heidelberg University Hospital, Germany
4. University of Zürich, Switzerland
5. Spinal Cord Injury Center, Bayreuth, Germany
6. Ulm University, Germany
7. University Hospital Motol, Prague, Czech Republic