BMC Medical Research Methodology

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Use of hierarchical models to evaluate performance of cardiac surgery centres in the Italian CABG outcome study

Paola D'Errigo*, Maria E Tosti, Danilo Fusco, Carlo A Perucci, Fulvia Seccareccia and the research group of the Italian CABG Outcome Study

BMC Medical Research Methodology 2007, 7:29 doi:10.1186/1471-2288-7-29

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