    Asante M, Lord J, Mendall M, Northfield T. Endoscopy for Helicobacter pylori seronegative young dyspeptic patients: an economic evaluation based on a randomized trial. Eur J Gastroenterol Hepatol 1999;11:851.6.
    Bradley F, Wiles R, Kinmonth AL, Mant D, Gantley M. Development and evaluation of complex Interventions in health services research: case study of the Southampton heart integrated care project (SHIP). The SHIP Collaborative Group. BMJ 1999;318:711.5.
    Lilford R, Royston G. Decision analysis in the selection, design and application of clinical and health services research. J Health Serv Res Pol 1998;3:159.66.(Accepted 25 April 2000)
    McCormick A, Fleming D, Charlton J. Morbidity statistics from general practice. Fourth national morbidity study 1991-1992. London: Office of Population Censuses and Surveys, 1995.
    Peto V, Coulter A, Bond A. Factors affecting general practitioners' recruitment of patients into a prospective study. Fam Practice 1993;10:207.11.
    Schulz KF, Chalmers I, Hayes RJ, Altman DG. Empirical evidence of bias.Dimensions of methodological quality associated with estimates of treatment effects in controlled trials. JAMA 1995;27:408.12.
    Wilson S, Delaney B, Roalfe A, Hobbs R. The ethics of paying GPs. BMJ 1999;318:1484.

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