1. Department of Occupational and Environmental MedicineUlsan University Hospital, University of Ulsan College of MedicineSouth Korea
2. Department of NeurologyUlsan University Hospital, University of Ulsan College of MedicineSouth Korea
3. Department of Internal MedicineUlsan University Hospital, University of Ulsan College of MedicineSouth Korea
4. Research Center for Occupational PoisoningTokyo Rosai HospitalJapan