1. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
2. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
3. Department of Neurosurgery, Neuroscience, Radiosurgery and Adaptive Hybrid Neurosurgery Research Center, Inje University Ilsan Paik Hospital, Goyang, Korea.