1. Department of Dermatology, Institute of Clinical Sciences; Sahlgrenska University Hospital; SE-413 45 Göteborg Sweden
2. Department of Clinical Genetics, Institute of Biomedicine; Sahlgrenska University Hospital; SE-413 45 Göteborg Sweden
3. Department of Clinical and Experimental Medicine, Division of Cell Biology and Dermatology; Linköping University; SE-581 85 Linköping Sweden