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John A Ford, Norman Waugh, Pawana Sharma, Mark Sculpher, Andrew Walker
BMJ Open. 2012; 2(1): e000671. Published online 2012 January 30. doi: 10.1136/bmjopen-2011-000671
PMCID:
PMC3269048
 Is Cited by the Following Articles in this Archive:
Steven G Casson, Francis J Ruiz, Alec Miners
BMJ Open. 2013; 3(1): e001870. Published online 2013 January 11. doi: 10.1136/bmjopen-2012-001870
PMCID:
PMC3549260