“…The majority of studies were based in single rheumatology departments or clinics [ 11 , 14 , 17 , 18 , 20–22 , 24–29 , 31–33 , 35 , 36 , 37 , 38 , 40 , 41 , 43 , 46–50 , 52 ], some studies used participants from multiple sites or centres [ 30 , 34 , 39 , 42 , 53 ], and some had many centres contributing to a single registry or database [ 13 , 19 , 23 , 45 ]. Study setting also varied by country with five each from the UK [ 14 , 32 , 34 , 36 , 45 ] and the USA [ 18 , 19 , 31 , 39 , 53 ], four each from Brazil [ 21 , 22 , 37 , 18 ] and Italy [ 42 , 43 , 50 , 52 ], three from Egypt [ 26 , 28 , 35 ], France [ 24 , 27 , 46 ] and Turkey [ 11 , 20 , 49 ], two from Denmark [ 23 , 33 ], Israel [ 47 , 51 ], Spain [ 13 , 40 ] and Pakistan [ 17 , 41 ], and one each from Australia […”