"E. R. Stitt, M.D., Ph.M., Sc.D., LL.D., Paul W. Clough, M.D., and Sara E. Branham, M.D., Ph.D., Sc.D. and Contributors. Practical Bacteriology, Hematology and Parasitology. 10th ed." published on Nov 1948 by The American Society of Tropical Medicine and Hygiene.
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Charles F. Craig (1948) studied this question.