Recruitment to a large scale randomised controlled clinical trial in primary care: the Helicobacter Eradication Aspirin Trial (HEAT)
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D. Kendrick | C. Hawkey | A. Avery | C. Coupland | M. Moore | F. R. Hobbs | J. Dumbleton | C. Morris | Murray D. Smith | D. Stevenson | Greg P. Rubin