1. The Department of Dermatology, University Hospital of Oulu PEDEGO Research Unit Oulu Finland
2. Medical Research Center, PEDEGO Research Group University of Oulu Oulu Finland
3. Infrastructure for Population Studies, Faculty of Medicine University of Oulu Oulu Finland
4. Department of Public Health University of Helsinki Helsinki Finland
5. Finnish Institute for Health and Welfare Helsinki Finland
6. Department of Health Security, Environmental Health Finnish Institute for Health and Welfare Kuopio Finland