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Kawai, K., Watanabe, Y. & Hayashi, K. An epidemiological study of gastric to duodenal ulcer ratio in Asian countries. Gastroenterol Jpn 26 (Suppl 3), 267–270 (1991). https://doi.org/10.1007/BF02779318
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DOI: https://doi.org/10.1007/BF02779318