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Knapp MS 《BMJ (Clinical research ed.)》2001,323(7305):165; discussion 166
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Boulvain M Faltin D Ibecheole V Irion O 《BMJ (Clinical research ed.)》2000,320(7232):445; author reply 446
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Liberati A Magrini N Patoia L Pagliaro L 《BMJ (Clinical research ed.)》1999,318(7190):1073-4; author reply 1074
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