“…Two of the studies are controlled trials (CT) [18] [19], while the other eight adopted a randomized controlled design (RCT) [20,21,22,23,24,25,26,27]. Main inclusion criterion was (sub-acute chronic) nonspecific low back pain � 6 weeks (1x, [25]), � 8 weeks (1x, [26]), �12 weeks (3 x, [20,21,22]), 24 weeks (1x, [18]). The baseline pain (VAS, 0-10 points) ranged from 2.9±0.8 [20] to 6.5±2.1 [22].…”