Letters

Thank you for publishing our article, A game of two halves (page 24, 6 January), in which we discuss the pros and cons of using publications as a measure of the value of NHS research and development. The leading research institution in this area is the Wellcome Trust policy unit. But a reference illustrating the constructive work at Wellcome was removed during editing. It is: Grant J, Cottrell R, Cluzea F and Fawcett G. Evaluating the payback on biomedical research by characterising papers cited on clinical guidelines. Br Med J , forthcoming.

Bronwyn Croxson R&D Office Great Ormond Street Hospital for Children trust