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Gregory A, Ramsay J, Agnew-Davies R, Baird K, Devine A, Dunne D, Eldridge S, Howell A, Johnson M, Rutterford C, Sharp D, Feder G.Gregory A, et al. Among authors: ramsay j.BMC Public Health. 2010 Feb 2;10:54. doi: 10.1186/1471-2458-10-54.BMC Public Health. 2010.PMID: 20122266Free PMC article.Clinical Trial.