title: [Strengthening of lumbar extensors (MedX)--therapy in chronic backache--an overview and meta-analysis].
authors.forename: P
authors.initials: P
authors.lastname: Neef
mesh_terms: 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