“…Study characteristics are described in Supplementary Table 6. 28 studies were performed in patients with IA; 18,19,26-28,30-36,47,49-51,55-57, 59-63,67,79,80,83 25 in patients with RA; 7,16,17,23,24,37,39,40,[42][43][44][45]53,54,58,66,68,70,[73][74][75][76][77][78]84 5 in patients with AS; 21,25,46,48,65 4 in patients with PsA; 41,64,71,81 4 in patients with UC; 22,69,72,82 2 in patients with IBD (with results reported separately for UC); 38,52 and one in patients with SpA. 29 Most studies were retrospective (n=37), while 28 were prospective and one was cross-sectional.…”