A double-blind, placebo controlled comparison of the morphine sparing effect of oral rofecoxib and diclofenac for acute renal colic

Engeler D, Ackermann D, Osterwalder J, Keel A, Schmid H. A double-blind, placebo controlled comparison of the morphine sparing effect of oral rofecoxib and diclofenac for acute renal colic. The Journal of urology 2005; 174:933-6.