1 Department of Gastroenterological Surgery, Hepato Pancreato Billiary Surgery Unit, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku 105-8470, Tokyo, Japan
2 Department of Pathology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku 105-8470, Tokyo, Japan
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