Smugar, S. S., Schnitzer, T. J., Weaver, A. L., Rubin, B. R., Polis, A. B., Tershakovec, A. M. Rofecoxib 12.5 mg, rofecoxib 25 mg, and celecoxib 200 mg in the treatment of symptomatic osteoarthritis: results of two similarly designed studies. Current Medical Research and Opinion 2006; 7: 1353-1367