1 Department of Radiology. Foundaton Instituto Valenciano de Oncología, C/ Beltrán Báguena, 19, 46009 Valencia, Spain; Spanish Back Pain Research Network, Spain. Electronic address: [email protected].
2 Spanish Back Pain Research Network, Spain; Kovacs Back Pain Unit. HLA-Moncloa University Hospital. 81, Avda. Valladolid. 28008 Madrid, Spain.