We thank Brett Scaife, medical statistician, Nuffield Institute for Health, University of Leeds, for his assistance with data analysis; Nick Fieller, medical statistician and lecturer, School of Mathematics and Statistics, University of Sheffield, for his comments; Professor P. Quirke, Department of Pathology, Leeds General Infirmary, for his support and the involvement of his department; and David Owens, Senior Lecturer in Psychiatry, for his comments on a previous draft of this paper.
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