1. Department of Health Sciences, Institute of Health and Society, University of Oslo, P.O. Box 1089, Blindern, 0317 Oslo, Norway
2. Institute of Basic Medical Sciences, Medical Faculty, University of Oslo, P.O. Box 1111, Blindern, 0317 Oslo, Norway
3. Faculty of Health and Social Sciences, Bergen University College, P.O. Box 7030, 5020 Bergen, Norway
4. Section for Climate Therapy, Oslo University Hospital, P.O. Box 4950, Nydalen, 0424 Oslo, Norway
5. Department of Dermatology, Oslo University Hospital, P.O. Box 4950, Nydalen, 0424 Oslo, Norway