Immunology Department, Churchill Hospital, Headington, Oxford 0X3 7LJ, *MRC Biostatistics Unit, Institute of Public Health, University Forvie Site, Robinson Way, Cambridge CB2 2SR, †HM Prison, Saughton, Edinburgh EH11 3LN †Regional Virus Hospital, City Hospital, Greenbank Drive, Edinburgh EH10 5SB, UK.
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Bird et al. (1993) studied this question.