1. Department of Biomedical Engineering; Wayne State University; Detroit Michigan
2. Neurosurgical and Spinal Department; Wirbelsäulenzentrum Fulda Main Kinzig; Germany
3. Orthopaedic Surgery, Maastricht University Medical Centre; Maastricht The Netherlands
4. The Centre for Spinal Studies and Surgery; Nottingham University Hospitals NHS Trust; Nottingham United Kingdom
5. Department of Orthopedics; Providence Hospital and Medical Centers; Southfield Michigan
6. Rizzoli Institute of Orthopedics; Bologna Italy