“…Fifty studies compared the intervention group to other interventions (nonoperative or operative), 4 studies compared the intervention group to placebo/sham, and 5 studies included a waitlist control group. Across the trials, there were 4108 participants (1589 males, 2123 females, and 396 sex not specified) and 39 trials were single centre31–71 and 20 were multicentre 41,72–91. Fourteen trials included participants with an acute duration of symptoms (≤3 mo),41,45,49,54–56,60,70,73,81,82,84,92 21 included participants with a chronic duration of symptoms (>3 mo),31–34,37,38,44,48,52,68,69,72,74–76,78,79,83,85–88,91,93 9 included participants with a mixture of acute and chronic symptoms,39,43,46,58,62,63,77,80,89,90 and 15 did not report symptom duration 35,36,42,47,50,51,57–59,64–67,71,88…”