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by Hansen, J. D. L.
Published in BMJ (1973)
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6
by Brock, J.F., Hansen, J.D.L.
Published in The Lancet (1974)
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7
by Pettifor, J M, Hansen, J D
Published in BMJ (1974)
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8
by Pimstone, B.L., Hansen, J.D.L.
Published in The Lancet (1969)
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9
by Purves, L.R., Hansen, J.D.L.
Published in The Lancet (1962)
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