“…The continents where the studies were conducted included Asia ( n = 16), 62,63,66,75,79,80,82–86,88–92 Europe ( n = 12), 64,67–74,76–78 America ( n = 2), 81,87 and Oceania ( n = 1) 65 . RA was investigated in 10 study groups, 66–71,73,79,88,91 SLE in nine, 66,72,75,81–83,86,87,89 BD in three, 62,76,77 AAV in three, 78,83,84 spondyloarthritis (SpA) and AS in three, 70,85,90 SSc in two, 64,74 OA in two, 65,70 gout in one, 80 crystal arthritis in one, 70 Takayasu arteritis (TA) in one, 63 and primary Sjögren's Syndrome (pSS) in one 92 . Twenty‐four studies were prospective 62–71,73–79,81,83–85,87,91,92 and the remaining seven retrospective 72,80,82,86,88–90 .…”