1. Department of Public Health and General Practice; Faculty of Medicine; NTNU; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Dermatology; St. Olavs Hospital; Trondheim University Hospital; Norway
3. Department of Endocrinology; St. Olavs Hospital; Trondheim University Hospital; Norway
4. Department of Rheumatology; St. Olavs Hospital; Trondheim University Hospital; Norway
5. Nord-Trøndelag Hospital Trust; Levanger Norway
6. Centro Studi Gruppo Italiano Studi Epidemiologici in Dermatologia (GISED); Bergamo Italy
7. Azienda Ospedaliera Papa Giovanni XXIII; Bergamo Italy
8. Department of Cancer Research and Molecular Medicine; Faculty of Medicine; NTNU; Norwegian University of Science and Technology; Trondheim Norway