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Gillespie P, O'Shea E, Murphy AW, Smith SM, Byrne MC, Byrne M, Cupples ME; SPHERE study team.Gillespie P, et al.Eur J Health Econ. 2012 Aug;13(4):429-43. doi: 10.1007/s10198-011-0314-2. Epub 2011 May 3.Eur J Health Econ. 2012.PMID: 21537952