“…Of the 19 studies that assessed nativity status, 37,46,49,50,64–73,75–79 77.8% were foreign‐born. Of the 29 studies that provided information on recruitment, 37–39,41–44,46–49,52,55,58–62,68–73,75–79 the mean refusal rate was 27.5% (range 3.7%–70.0%). Of the 39 studies that provided information on attrition, 35–39,41–49,51–55,57–59,61–64,66,67,69–73,75–79 the mean attrition rate was 20.6% at final follow‐up (range 0.0%–64.9%).…”