1. Department of Radiation Sciences; Umea University; Umea Sweden
2. Department of Medical Epidemiology and Biostatistics; Karolinska Institute; Stockholm Sweden
3. Centre for Population Studies/Ageing and Living Conditions Programme, Department of Geography and Economic History; Umea University; Umea Sweden
4. Division of Epidemiology and Global Health, Department of Public Health and Clinical Medicine; Umea University; Umea Sweden