Hansell, A., Hollowell, J., McNiece, R., Nicholls, T. and Strachan, D. (1999) Use of the General Practice Research Database (GPRD) for respiratory epidemiology: a comparison with the 4th Morbidity Survey in General Practice (MSGP4). Thorax - An International Journal of Respiratory Medicine, 54(5), pp. 413-419. ISSN (print) 0040-6376
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