Peptic ulcer in rheumatoid arthritis.
D001172:Arthritis, Rheumatoid / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D010003:Osteoarthritis / Q000150:complications; D010437:Peptic Ulcer / Q000150:complications* / Q000453:epidemiology; D012107:Research Design / Q000592:standards