A Randomized Trial Comparing the Effect of Rofecoxib, a Cyclooxogenase 2-Specific Inhibitor, With That of Ibuprofen on the Gastroduodenal Mucosa of Patients With Osteoarthritis. - Laine,L.; Harper,S.; Simon,T.; Bath,R.; Johanson,J.; Schwartz,H.; Stern,S.; Quan,H.; Bolognese,J. (Gastroenterology, 1999)