1 23 European Spine Journal ISSN 0940-6719 Eur Spine J DOI 10.1007/s00586-013-2823-4 The evidence on surgical interventions for low back disorders, an overview of systematic reviews Wilco C. H. Jacobs, Sidney M. Rubinstein, Paul C. Willems, Wouter A. Moojen, Ferran Pellisé, Cumhur F. Oner, Wilco C. Peul, et al.