RAPID RESPONSE FROM BMJ.COMBMJ 2005; 331 doi: https://doi.org/10.1136/bmj.331.7513.E371 (Published 11 August 2005) Cite this as: BMJ 2005;331:E371
- Juan-Carlos Maldonado, clinical research fellow
- Pharmacology Unit, Biomedical Center Central University of Ecuador PO Box 17-11-6120, Quito, Ecuador.
Following is an edited excerpt from one of the Rapid Responses generated by this article, all of which can be read in their entirety at http://bmj.bmjjournals.com/cgi/eletters/330/7504/1370.—Editor
…In an observational study, a crucial question concerns the appropriateness of the control group. In this study the reference group received celecoxib (unknown prescribed …