Todd S, McGuinness B, Passmore A P
Ageing Group, Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences, The Queen's University of Belfast, Belfast, UK.
Int J Clin Pract. 2010 Nov;64(12):1595-8. doi: 10.1111/j.1742-1241.2010.02490.x.