1. National Institute for Health and Clinical Excellence Quality standard 15: quality standard for patient experience in adult NHS services London NICE 2012 http://guidance.nice.org.uk/QS15
2. Office for Economic Cooperation and Development Health at a glance 2011 www.oecd-ilibrary.org/sites/health_glance-2011-en/04/09/index.html?itemId=/content/chapter/health_glance-2011-37-en