https://www.esri.ie/system/files/publications/RS123.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/602309/58551_NHS_PRB_Accessible.pdf
http://www.bsa.natcen.ac.uk/latest-report/british-social-attitudes-34/key-findings/context.aspx?_ga=2.25464057.552181158.1498632950-1412959047.1496247036
https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf