Affiliations

• ¹ Department of Hepato-Biliary-Pancreatic Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan.
• ² Division of Gastrointestinal, Breast, and General Surgery, Department of Surgery, Shiga University of Medical Science, Otsu, Japan.
• ³ Second Department of Surgery, Wakayama Medical University, Wakayama, Japan.
• ⁴ Department of General and Gastroenterological Surgery, Osaka Medical College, Takatsuki, Osaka, Japan.
• ⁵ Department of Medical Statistics, Osaka City University Graduate School of Medicine, Osaka, Japan.
• ⁶ Department of Surgery, Nara Medical University, Kashihara, Nara, Japan.
• ⁷ Department of Surgery, Faculty of Medicine, Kindai University, Osaka-Sayama, Osaka, Japan.
• ⁸ Department of Surgery, Hirakata Hospital, Kansai Medical University, Hirakata, Osaka, Japan.
• ⁹ Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan.
• ¹⁰ Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan.