We wish to thank Dr. D. K. Gamble, Public Health Laboratory, Epsom, Dr. Trevor Thomas, Divisional Medical Officer of Health, Glamorgan County Council, Dr. G. M. Medlicott, Assistant Medical Officer of Health, Glamorgan County Council, Dr. J. F. Soothill now of the Hospital for Sick Children, Great Ormond Street, London, and Mr. R. M. Marshall, Department of Medical Illustration, Cardiff Royal Infirmary, for their help.
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EVANS et al. (1967) studied this question.
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