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- [22] Bismuth-based quadruple therapy using a single capsule of bismuth biskalcitrate, metronidazole, and tetracycline given with omeprazole versus omeprazole, amoxicillin, and clarithromycin for eradication of Helicobacter pylori in duodenal ulcer patients:: A prospective, randomized, multicenter, North American trial [J]. AMERICAN JOURNAL OF GASTROENTEROLOGY, 2003, 98 (03): : 562 - 567