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Document Type: Research Article


Affiliations: 1: Centre for Operational Research and Applied Statistics Maxwell Building University of Salford Salford M5 4WT UK, Email: 2: Department of Statistics University of Warwick Coventry CV4 7AL UK, Email: 3: Department of Health Sciences University of Leicester Leicester LE1 6TP UK, Email:

Publication date: July 1, 2006

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