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Recruiting and retaining GPs and patients in intervention studies: the DEPS-GP project as a case study

Michelle K Williamson*, Jane Pirkis, Jon J Pfaff, Orla Tyson, Moira Sim, Ngaire Kerse, Nicola T Lautenschlager, Nigel P Stocks and Osvaldo P Almeida

BMC Medical Research Methodology 2007, 7:42  doi:10.1186/1471-2288-7-42