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Institute of Public Health in Ireland, Forestview, Purdy's Lane, Belfast BT8 7ZX, UK
Received 30 July 2008; received in revised form 10 November 2008; accepted 16 December 2008. published online 27 March 2009.
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PII: S0033-3506(08)00357-0
doi:10.1016/j.puhe.2008.12.025
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