1. Department of Dermatology, Tampere University Hospital, Tampere, Finland
2. School of Medicine, University of Tampere, Tampere, Finland
3. Department of Lifestyle and Participation, National Institute for Health and Welfare, Helsinki, Finland
4. Unit of Family Practice, Central Finland Central Hospital, Jyväskylä, and Unit of Primary Health Care, Kuopio University Hospital, Kuopio, Finland
5. Department of Gastroenterology and Alimentary Tract Surgery, Tampere University Hospital, Tampere, Finland
6. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland
7. School of Health Sciences, Tampere University Hospital, Tampere, Finland