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Low Back Pain
Intervertebral Disk Displacement
Back Pain
Sciatica
Neck Pain
Chronic Disease
Denmark
Exercise Therapy
Disability Evaluation
Physical Therapy Modalities
Lumbar Vertebrae
Pain Measurement
Prospective Studies
Magnetic Resonance Imaging
Treatment Outcome
Reproducibility of Results
Time Factors
Risk Factors
Questionnaires
Exercise
Co-Publications
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