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. Author manuscript; available in PMC: 2018 Jun 27.
Published in final edited form as: Spine J. 2018 Jan 31;18(5):866–879. doi: 10.1016/j.spinee.2018.01.013

Fig. 2.

Fig. 2

Flow of included studies. CCT, controlled clinical trial; CLBP, chronic low back pain; OBS, observational studies; RCT, randomized controlled trial.