1. NHS Information Centre (2011) Health Survey for England — 2010: respiratory health. (The Information Centre, Leeds) http://www.ic.nhs.uk/searchcatalogue?productid=10152&returnid=1685 (accessed 9 Jan 2013).
2. Bromley C Corbett J Day J (2011) Scottish Health Survey 2010 (The Scottish Government, Edinburgh) http://www.scotland.gov.uk/News/Releases/2011/09/27102058 (accessed 12 Dec 2012).
3. Bromley C Bradshaw P Given L (2009) Scottish Centre for Social Research. Scottish Health Survey 2008 (The Scottish Government, Edinburgh) http://www.scotland.gov.uk/Publications/2009/09/28102003/0 (accessed 12 Dec 2012).
4. Scottish Intercollegiate Guidelines Network. (1996) Obesity in Scotland: integrating prevention with weight management. SIGN guideline no 8. (Scottish Intercollegiate Guidelines Network, Edinburgh).
5. XENical in the Prevention of Diabetes in Obese Subjects (XENDOS) Study