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. 2007 Oct;83(984):659–663. doi: 10.1136/pgmj.2007.058511

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Figure 4 All patients with length of stay (LOS) >30 days; percentage change between 2002 and 2003/04 by volume. Black graph lines represent upper and lower 95% confidence intervals (CI). Grey graph lines represent upper and lower 99.8% CI.