R. Anderson, B. Sc. (HONS), A. R. Rabson, M.B., B.Ch., D.C.P., R. Sher, M.B., B.Ch., H.J. Koornhof, M.B., ChB., F.R.C.Path.; The N.B.T. Test in Cigarette S
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Anderson et al. (1974) studied this question.