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James Coulter Smyth, O.B.E., F.F.D., L.R.C.P. & L.M., L.R.C.S. & L.M. Br Dent J 133, 513–514 (1972). https://doi.org/10.1038/sj.bdj.4802943
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DOI: https://doi.org/10.1038/sj.bdj.4802943