Analysis of Reoperations after Surgical Treatment of Degenerative Cervical Spine Disorders: A Report on 900 Cases - Greiner-Perth, R.; Allam, Y.; El-Saghir, H.; Röhl, F.; Franke, J.; Böhm, H. (Central European Neurosurgery - Zentralblatt für Neurochirurgie, 2009)