Correction to: Influence of HLA-B27 on the Ankylosing Spondylitis phenotype: results from the REGISPONSER database by Arévalo, Marta, Masmitjà, Jordi Gratacós, Moreno, Mireia, Calvet, Joan, Orellana, Cristobal, Ruiz, Desirée, Castro, Carmen, Carreto, Pilar, Larrosa, Marta, Collantes, Eduardo, Font, Pilar, Estévez, Eduardo Collantes, Roura, Xavier Juanola, Sueiro, Jose Luis Fernández, Fernández, Carlos González, Masmitjá, Jordi Gratacós, Mendoza, Juan Mulero, Alonso, Juan Carlos Torre, Dapica, Pilar Fernández, Arévalo, Mª. Elia Brito Brito, Gualda, Enrique Batlle, Linares Ferrando, Luis F, Navarro, Enrique Judez, Galeano, Carlos Vázquez, Poch, Teresa Clavaguera, Espartero, Mª. Cruz Fernández, Secall, Enrique Calero, Busquets, Manuel Pujol, Lozano, Carlos Rodríguez, Moreno Ramos, Manuel J, Quintana, Eduardo Cuende, Prada, Manuel Fernández, Silva, Rubén Queiro, Ruzafa, Estefanía Moreno, Morales, Carlos Montilla, López, Alicia García, Ãbeda, Eugenio Giménez, Más, Antonio Juan, Le Quement, Cristina Medrano, Ornilla, Enrique

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