BMJ 2005; 331 doi: https://doi.org/10.1136/bmj.331.7513.E371 (Published 11 August 2005) Cite this as: BMJ 2005;331:E371
  1. Juan-Carlos Maldonado, clinical research fellow
  1. 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 …

    View Full Text

    Sign in

    Log in through your institution

    Free trial

    Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
    Sign up for a free trial