C D Forbes, M.B., Ch.B., M.R.C.P., J A Craig, B.Sc., M.B., Ch.B., R Mitchell, B.Sc., M.B., Ch.B., M.R.C.Path., G P McNicol, M.D., Ph.D., M.R.C.Path., F.R.C
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Forbes et al. (1972) studied this question.