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2. Thursfield, H., & Paterson, D. H., Brit. J. Child. Dis., Lond., 1922, XIX, 27.
3. Paterson, D. H., & Greenfield, J. G., Quart. J. Med., Oxford, 1923, LXV, 6.
4. Parsons, L. G., Practitioner, Lond., 1930, CXXV, 146.
5. Byfield, A. H., Am. J. Dis. Child., Chicago, 1920, XX, 347.