Alfred K. Neumann, M.A., M.D., M.P.H., F.A.B.P.M., Frederick T. Sai, M.B., B.S., F.R.C.P., M.P.H., D.T.M. & H., Silas R. A. Dodu, M.B., CH.B., M.D., F.R.C.
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Neumann et al. (1974) studied this question.