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D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission; D001660:Biliary Tract Diseases / Q000601:surgery; D001943:Breast Neoplasms / Q000601:surgery; D015179:Colorectal Neoplasms / Q000601:surgery; D003424:Crohn Disease / Q000601:surgery; D005767:Gastrointestinal Diseases / Q000601:surgery; D013502:General Surgery; D006801:Humans; D008107:Liver Diseases / Q000601:surgery; D016377:Organ Transplantation; D010182:Pancreatic Diseases / Q000601:surgery; D013514:Surgical Procedures, Operative; D014656:Vascular Surgical Procedures