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The Excel spreadsheets associated with this paper have been tested extensively but have not been validated formally. The ACB accepts no liability for errors in statistical anlaysis or conclusions reached as a result of using this software.

Some virus detection products commonly used by health institutions are unable to complete their scanning routines for the Excel spreadsheets provided. This may result in  warning messages and/or a failure to open the spreadsheets. Other virus scanning products erroneously detect ‘macros’ although none exist in this software. Where this occurs, the institution’s information technology department should be consulted.

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