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Atlas of axial spondyloarthritis in Spain 2017: Study design and population Marco Garrido-Cumbrera, Victoria Navarro-Compán, Pedro Zarco, Eduardo Collantes-Estévez, David Gálvez-Ruiz, Olta Braçe, Jorge Chacón García, Carles Blanch Mur, Angels Costa Ferrer, Alvaro Hidalgo Vega, Pedro Plazuelo Ramos, Jordi Gratacós Masmitja