The need for comparative data in spondyloarthritis - Choy, Ernest; Baraliakos, Xenofon; Behrens, Frank; D’Angelo, Salvatore; de Vlam, Kurt; Kirkham, Bruce W.; Østergaard, Mikkel; Schett, Georg A.; Rissler, Michael; Chaouche-Teyara, Kamel; Perella, Chiara (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)