- Correspondence to Dr Beverly A Roberts, Centre for Cognitive Ageing and Cognitive Epidemiology, Department of Psychology, University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK;
- Accepted 6 September 2010
- Published in print 1 November 2011.
- Published online 12 October 2011.
- Published first 12 October 2010.
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