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APA Citation
Mohammed, M. A., Deeks, J. J., Girling, A., Rudge, G., Carmalt, M., Stevens, A. J., & Lilford, R. J. (2009). evidence of methodological bias in hospital standardised mortality ratios: retrospective database study of English hospitals. BMJ, 338, . http://access.bl.uk/ark:/81055/vdc_100144712450.0x00002b