1. 1Research Institute of Public Health and Departments of
2. 4Savonlinna Central Hospital, Savonlinna, Finland;
3. 3Physiology, University of Kuopio, Kuopio, Finland;
4. 5Department of Medicine, Kuopio University Hospital, Kuopio, Finland; and
5. 6Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland
6. 2Community Health and General Practice and