Marketing studies and scientific research must be distinctBMJ 2001; 322 doi: https://doi.org/10.1136/bmj.322.7296.1249 (Published 19 May 2001) Cite this as: BMJ 2001;322:1249
- E Ernst, professor ([email protected])
- Department of Complementary Medicine, University of Exeter, Exeter EX2 4NT
EDITOR—Drew and Davies's trial to assess the effectiveness of Ginkgo biloba in tinnitus, which was conducted by post and telephone, raises several important methodological issues.1 The advantages of such a design are obvious: easy and quick recruitment of patients allowing large sample sizes at comparatively low costs. …
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