1. Division of Gastrointestinal SurgeryDepartment of SurgeryGraduate School of MedicineKobe University Kobe Japan
2. Division of Minimally Invasive SurgeryDepartment of SurgeryGraduate School of MedicineKobe University Kobe Japan
3. Division of Community Medicine and Medical NetworkDepartment of Social Community Medicine and Health ScienceGraduate School of MedicineKobe University Kobe Japan