Affiliation: | 1. Department of Internal Medicine, Fukuwatari Municipal Hospital, Okayama, Japan 3. Department of Internal Medicine, Nippon Kokan Fukuyama Hospital, Fukuyama, Japan 2. Department of Internal Medicine, Hiroshima City Hospital, 7-33 Motomachi, Nakaku, Hiroshima, 730-8518, Japan 4. Department of Surgery, Nippon Kokan Fukuyama Hospital, Fukuyama, Japan 5. Department of Bacteriology, Okayama University Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama, Japan 6. Department of Medicine and Medical Science, Okayama University Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama, Japan
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