1Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea. yanghokm@nuri.net
2Department of Neurology and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
3Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4Department of Radiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/