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| 1 | Conditions listed in this trial | ||||
| Back Pain | |||||
| Occupational Diseases | |||||
| 2 | Additional conditions recognized in this trial | ||||
| Back Injuries | |||||
| 3 | More general conditions related to this trial | ||||
| Disorders of Environmental Origin | |||||
| Nervous System Diseases | |||||
| Neurologic Manifestations | |||||
| Pain | |||||
| Signs and Symptoms | |||||
| Wounds and Injuries | |||||
| 4 | Sponsors listed in this trial | ||||
| Department of Veterans Affairs | |||||