1. Department of Dermatology, Dongguk University International Hospital, College of Medicine, Dongguk University, Goyang, Korea.
2. Department of Pathology, Dongguk University International Hospital, College of Medicine, Dongguk University, Goyang, Korea.
3. Department of Occupational Medicine, Dongguk University International Hospital, College of Medicine, Dongguk University, Goyang, Korea.