- Correspondence to: D Kirklin Department of Primary Care and Population Sciences, Royal Free and University College Medical School, Archway Campus, 2nd Floor Holborn Union Building, 2-10 Highgate Hill, London N19 5LW, UK;
- Received November 16, 2005
- Accepted March 28, 2006
- Revised March 22, 2006
- First published June 29, 2007.
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