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The man or woman on the Clapham omnibus feels instinctively that screening must be agood thing. Many clinicians think the same—especially when it concerns diseases that they happen to have a special interest in.Read Screening (C Reckham, British Medical Bulletin, £34.95, ISBN 1 85315 345 1) for the intellectual equivalent of a cold shower.Did you know, for example, that, over a lifetime, a woman is more likely to receive a cervical smear result that incorrectly identifies her as having a condition that might develop into …