1. Department of Health Sciences; Karlstad University; Karlstad Sweden
2. School of Medical Sciences; Örebro University; Örebro Sweden
3. Division of Occupational and Environmental Medicine; Lund University; Lund Sweden
4. Department of Dermatology; Lund University; Lund Sweden
5. Department of Preventive Medicine; Icahn School of Medicine at Mount Sinai; New York NY USA