Mokhun Neck and Beck Hospital, Seoul, b Hong& Neurosurgery Hospitd, Seongnsm. Repubbc of Korea. `Department of Physical Modoine and Rehabatation. ° Department of Anesthesdogy. airision of Pan Afflit,ine. Mayo ant. Rochester. MN. USA. "Kaman Meotne Clara, Thai Center. Korean Modern's Hosatd. Kyung Hee Unryerstty. Seoul. R