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ED-T and CC contributed equally.
Contributors ED-T, CC and EBC conceived the study and wrote the article. LA, SG, SB-M, EB, GP, ML, MC, MrT, MaT, MoT, SA contributed to patient clinical care, data collection and interpretation. PM and LD provided significant advice and supervision, drafting a significant portion of the manuscript. All authors approved the final version of the manuscript. ED-T and CC contributed equally as first authors.
Funding This work was supported by “Fondazione Italiana per la Ricercasull’Artrite” (FIRA Onlus 2014) and by the “Collegio Ghislieri” (Pavia).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.