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Reboussin BA, Ip EH, Wolfson M.Reboussin BA, et al.J R Stat Soc Ser A Stat Soc. 2008 Oct;171(4):877-897. doi: 10.1111/j.1467-985X.2008.00544.x.J R Stat Soc Ser A Stat Soc. 2008.PMID: 19079793Free PMC article.