- Correspondence to: Gwen M Sayers Consultant Physician and Honorary Clinical Senior Lecturer (Imperial College School of Medicine), Department of General and Geriatric Medicine, Northwick Park Hospital, Watford Road, Middlesex HA1 3UJ;
- Accepted 10 November 2004
- Published in print 1 June 2006.
- Published online 26 May 2006.
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