1. Department of Oral Pathology; Faculty of Odontology; Malmö University; 205 06 Malmö Sweden
2. Department of Occupational and Environmental Dermatology; Lund University, Skåne University Hospital; 205 02 Malmö Sweden
3. Department of Prosthodontics; Faculty of Odontology; Malmö University; 205 06 Malmö Sweden