1. Division of Pulmonary Medicine, Department of Medicine, Jichi Medical University, Japan
2. Department of Radiology, Jichi Medical University, Japan
3. Division of Neurology, Department of Medicine, Jichi Medical University, Japan
4. Division of Intensive Care, Department of Anesthesiology and Intensive Care Medicine, Jichi Medical University, Japan
5. Postgraduate Clinical Training Center, Jichi Medical University Hospital, Japan