- Correspondence to Dr M D Pickersgill, Public Health Sciences Section, Division of Community Health Sciences, College of Medicine and Veterinary Medicine, University of Edinburgh, Medical School, Teviot Place, Edinburgh EH8 9AG, UK;
- Received March 8, 2009
- Revised June 19, 2009
- Accepted July 22, 2009
- First published October 30, 2009.
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