REFERENCES
1). McBride ED. Disability Evaluation. 6th ed.Philadelphia: JB Lippincott Co;p. 540. 1963.
2). Korean Orthopaedic Association. Disability evaluation,1st ed. Seoul: Seoul Medical Co;255. 2005.
3). American Medical Association. Guides to the evaluation of permanent impairment. 5th ed.Chicago: American Medical Association;p. 613. 2000.