Affiliation: | (1) Sint Maartenskliniek, Institute of Spine Surgery and Applied Research, Hengstdal 3, 6522 JV Nijmegen, The Netherlands;(2) Department of Orthopaedics, Deventer Ziekenhuis, PO Box 5001, 7400, GC, Deventer, The Netherlands;(3) Sint Maartenskliniek, PO Box 9011, 6500 GM Nijmegen, The Netherlands |