1. Department of Dermatology & Venereology; Gadjah Mada University, Sekip Utara; Yogyakarta 55281 Indonesia
2. Department of Dermatology; University Medical Center Groningen, University of Groningen; Groningen The Netherlands
3. Department of Occupational and Environmental Dermatology; SUS Malmö, University of Lund, Jan Waldenströmsgata, 20502; Malmö Sweden
4. Department of Chemistry; Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara; Yogyakarta 55281 Indonesia