Methods: All aims were ascertained using a cohort of respondents to a mail health survey conducted by the Public Health Institute of Iceland, titled Health and Well-being in Iceland.
Aðferðir: Allar rannsóknirnar voru unnar úr stórri heilsufarsrannsókn sem framkvæmd var á vegum Embættis landlæknis árin 2007 og 2009.