Affiliation: | 1. Second Department of Surgery, Wakayama Medical University, School of Medicine, 811-1 Kimiidera, Wakayama, 641-8510, Japan 2. Department of Surgery, Institute of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551, Japan
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