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apd: 14 May 2001
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Yoshizumi, T., Ikeda, T., Ohta, S. et al. Abdominal ultrasonography reveals the perforation site of duodenal ulcers . Surg Endosc 15, 757–758 (2001). https://doi.org/10.1007/s004640042011
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DOI: https://doi.org/10.1007/s004640042011