1. Department of Dermatology; Kaohsiung Medical University; Kaohsiung Taiwan
2. Department of Dermatology, College of Medicine; National Taiwan University; Taipei Taiwan
3. Department of Occupational Medicine; College of Medicine, Kaohsiung Medical University; Kaohsiung Taiwan
4. Department of Environmental and Occupational Health; National Cheng Kung University Medical College; Tainan Taiwan