Author information:
(1)Department of Radiology, Valencian Oncology Institute Foundation, Valencia, 
Spain; Research Institute in Health Services Foundation, Valencia, Spain; 
Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, Spain. 
Electronic address: aranae@uv.es.
(2)Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, 
Spain; Scientific Department, Kovacs Foundation, Palma de Mallorca, Spain.
(3)Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, 
Spain; CIBER Epidemiology and Public Health (CIBERESP), Spain; Clinical 
Biostatistics Unit, Hospital Ramón y Cajal, IRYCIS, Madrid, Spain.
(4)Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, 
Spain; Department of Radiology, Hospital Regional Universitario Carlos Haya, 
Málaga, Spain.
(5)Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, 
Spain; Center for Biomaterials and Tissue Engineering, Universitat Politècnica 
de València, Valencia, Spain.
(6)Spanish Back Pain Research Network, Kovacs Foundation, Palma de Mallorca, 
Spain; CIBER Epidemiology and Public Health (CIBERESP), Spain; Clinical 
Biostatistics Unit, Hospital Ramón y Cajal, IRYCIS, Madrid, Spain; Barts and the 
London School of Medicine & Dentistry. Queen Mary University of London, London, 
UK.
(7)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; CIBER Epidemiology and Public Health (CIBERESP), 
Spain; Clinical Biostatistics Unit. Hospital Ramón y Cajal, IRYCIS. Ctra. 
Colmenar Km. 9.1, 28034 Madrid, Spain.
(8)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario la Princesa, Madrid, 
Spain.
(9)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Rey Juan Carlos, 
Móstoles, Madrid, Spain.
(10)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Fundación Jiménez Díaz, 
Madrid, Spain.
(11)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Central de Asturias, 
Asturias, Spain.
(12)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Son Llàtzer, Palma de Mallorca, Spain.
(13)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Complejo Hospitalario Universitario de Albacete, 
Albacete, Spain.
(14)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario y Politécnico La Fe, 
Valencia, Spain.
(15)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Vall d'Hebron, Barcelona, Spain.
(16)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Nacional de Parapléjicos, Toledo, 
Spain.
(17)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Fundación Instituto Valenciano de Oncología, 
Valencia, Spain.
(18)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Instituto Oncológico Xanit, Benalmádena, Málaga, 
Spain.
(19)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Reina Sofía, Córdoba, 
Spain.
(20)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; OSATEK. Hospital de Galdakao, Vizcaya, Spain.
(21)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Consorcio hospitalario Provincial de Castellón, 
Castellón, Spain.
(22)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Cruces, Barakaldo, 
Vizcaya, Spain.
(23)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Puerta del Mar, Cádiz, 
Spain.
(24)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Clínico Universitario de Valencia, 
Valencia, Spain.
(25)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital General Universitario Gregorio Marañón, 
Madrid, Spain.
(26)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Ramón y Cajal, Madrid, 
Spain.
(27)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario la Paz, Madrid, Spain; HM 
Universitario Sanchinarro, Madrid, Spain.
(28)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Intermutual de Levante, San Antonio de 
Benagéber, Valencia, Spain.
(29)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Clinic de Barcelona, Barcelona, Spain.
(30)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital de Manacor, Manacor, Islas Baleares, 
Spain.
(31)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Arnau de Vilanova, Valencia, Spain.
(32)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Puerta de Hierro 
Majadahonda, Madrid, Spain.
(33)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; HM Universitario Sanchinarro, Madrid, Spain.
(34)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Marqués de Valdecilla, 
Santander, Spain.
(35)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Fundación Alcorcón, 
Alcorcón, Madrid, Spain.
(36)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Donostia, Donostia, 
Spain.
(37)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Clínica Oncosur, Córdoba, Spain.
(38)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Clínica Oncosur, Granada, Spain.
(39)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital de la Santa Creu i Sant Pau, Barcelona, 
Spain.
(40)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Doctor Peset, Valencia, Spain.
(41)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Duran i Reynals, l'Hospitalet de 
Llobregat, Barcelona, Spain.
(42)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital POVISA, Vigo, Spain.
(43)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario de Salamanca, Salamanca, 
Spain.
(44)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Virgen del Rocío, 
Sevilla, Spain.
(45)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario de Canarias, Islas 
Canarias, Spain.
(46)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Virgen de las Nieves, 
Granada, Spain.
(47)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario la Paz, Madrid, Spain.
(48)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario 12 de Octubre, Madrid, 
Spain.
(49)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital 9 de Octubre, Valencia, Spain.
(50)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Hospital Universitario Virgen de la Arrixaca, 
Murcia, Spain.
(51)Spanish Back Pain Research Network. Kovacs Foundation, Paseo de Mallorca 36, 
07012 Palma de Mallorca, Spain; Complejo Hospitalario de Navarra, Navarra, 
Spain.