H. M. SAXTON, M.B. B.S. F.R.C.P. F.F.R. D.M.R.D., C. S. OGG, B.Sc. M.D. M.R.C.P. M.R.C.S. D.Obst. R.C.O.G., J. S. CAMERON, B.Sc. M.D. F.R.C.P. M.R.C.S.; NEEDLE
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Saxton et al. (1972) studied this question.