Thompson C, Petrovic M, Duffell E, Chaloner J
Trafford Primary Care Trust, Department of Public Health, 2nd Floor, Oakland House, Talbot Road, Old Trafford, Manchester M16 0PQ, UK.
Public Health. 2009 Jan;123(1):86-8. doi: 10.1016/j.puhe.2008.07.017. Epub 2008 Dec 16.