Department of Surgery;
Ulsan University Hospital;
University of Ulsan College of Medicine;
Department of Hepatobiliary and Pancreatic Surgery;
Yonsei University College of Medicine;
Pancreaticobiliary Cancer Clinic;
Yonsei Cancer Center;
Institute of Gastroenterology;
Yonsei Severance Hospital;
Preoperative; defining; system; Pancreas; head; cancer; Borderline; resectable; Adjusted; CA19-9; Neoadjuvant;