1. Department of Neurosurgery, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Department of Nuclear Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
3. Department of Rehabilitation Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
4. Department of Neurology, School of Medicine, Kyungpook National University, Daegu, Korea.