[Strengthening of lumbar extensors (MedX)--therapy in chronic backache--an overview and meta-analysis].
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D005069:Evaluation Studies as Topic; D005081:Exercise Therapy; D006801:Humans; D017116:Low Back Pain / Q000534:rehabilitation*; D015201:Meta-Analysis as Topic; D010147:Pain Measurement; D026741:Physical Therapy Modalities; D016896:Treatment Outcome