1. Orthopaedic BiomechanicsDepartment of Biomedical EngineeringEindhoven University of TechnologyEindhovenThe Netherlands
2. Institute for BiomechanicsDepartment of Health Sciences and TechnologyETH ZurichZurichSwitzerland
3. Department of Health SciencesUniversity of PotsdamPotsdamGermany
4. Schön Clinic Munich Harlaching (Academic Teaching Hospital and Spine Research Institute of the Paracelsus Medical University in Salzburg)MunichGermany
5. Department of OrthopedicsUniversity Medical Center UtrechtUtrechtThe Netherlands