1. Department of Radiology, China Medical University Hospital , Taichung, Taiwan
2. Division of Critical Care Medicine, Chu Shang Show Chwan Hospital , Nantou, Taiwan
3. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, China Medical University Hospital , Taichung, Taiwan
4. School of Medicine, College of Medicine, China Medical University , Taichung, Taiwan
5. Division of Otorhinolaryngology, Chu Shang Show Chwan Hospital , Nantou, Taiwan