Tolhurst, David E. M.B., F.R.C.S.; Haeseker, Barend M.D.; Zeeman, Rein Jac. M.D.; Barclay, T. L. Ch.M., F.R.C.S.; Barclay, T. L. Ch.M., F.R.C.S. Author Information
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Tolhurst et al. (1983) studied this question.