“…Most of these reviews were published [6,42,76,78,83,88,90,135,146,190,192], but preliminary results from one Cochrane review on patient education (A. Engers et al, submitted for publication) that has been submitted for publication were also used. Because no Cochrane review was available, we used two recently published systematic reviews for the evidence summary on antidepressants [161,170]. The Cochrane review on work conditioning, work hardening, and functional restoration [163] was not taken into account because all trials included in this review were also included in the reviews on exercise therapy and multidisciplinary treatment.…”