Garcia Rodriguez LA, Walker AM, Perez GS. Nonsteroidal anti-inflammatory drugs and gastrointestinal hospitalizations in Saskatchewan: a cohort study. Epidemiology. 1992 Jul 1;3(4):337-42.
Bollini P, Garcia Rodriguez LA, Perez GS, Walker AM. The impact of research quality and study design on epidemiologic estimates of the effect of nonsteroidal anti-inflammatory drugs on upper gastrointestinal tract disease. Arch Intern Med. 1992 Jun 1;152(6):1289-95.
Euler AR, Johnson JA, Dawson D, Kleoudis C, McSorley DJ. A comparison of ranitidine 150mg and placebo administered at bedtime for maintenance of recurrent benign gastric ulcers. Am J Gastroenterol. 1992;87(9):1267.