Financial support

• Northern Norway Health Authority (Grant SFP1227-15)
• The Norwegian Cancer Society (Grant 4510766-2013), (PK2009-0430,PK01-2009-0341)
• UiT The Arctic University of Norway
• The Aakre Foundation

Acknowledgements

We acknowledge the services of the Cohort of Norway (CONOR) Study investigators and the contributing research centers delivering data to CONOR. We acknowledge the work from Data manager Knut Hansen and System analyst Ilene Brill for merging the different surveys and preparing the master data file. We want to thank all the study participants.