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The Korean military service law about spinal disc herniation.
a)Positive result of electromyogram test was defined as matched radiculopathy finding according to suspicious level of herniation; b)spinal canal stenosis was defined as the narrowing of the spinal canal more than 50% of mid-sagittal diameter (front to back) in the same plane of imaging study; c)cut-off sign was defined as all loss of signal in neuromuscular at the interesting level using imaging study.
