Blagov, I.; Clinic of Abdominal Surgery, University Hospital "St. Ann", Sofia, Sechanov, I.; Clinic of Abdominal Surgery, University Hospital "St. Ann", Sofia, Katev, N.; Medical University Sofia, Goranov, N.; Medical University Sofia, Jaramov, N.; Medical University Sofia, Radionov, M.; General and endoscopic surgery clinic, University hospital "Saint Anna" Sofia, Shirouzu, K.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Kinugasa, T.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Akagi, Y.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Damianov, N.; Military medical academy -Sofia, Ward of coloproctology, Iliev, S.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Tonchev, P.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Presolski, I.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Grozev, V.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Filipov, F.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Mirochnik, P.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Raycheva, W.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Ristovski, I.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Hristova, V.; Military medical academy -Sofia, Ward of coloproctology, Yaramov, N.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Sokolov, M.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Petrov, B.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Pavlov, V.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Grozdev, K.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Melnikov, V.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Presolski, I.; I-st Surgical Clinic, Department of septic surgery - University Hospital "Dr. George Stransky" - Pleven, Kyosev, V.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Vasilev, K.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Ivanov, P.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Kotashev, G.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Grigorov, G.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Hristov, D.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Barsukov, Y.A.; Department of Colorectal Cancer, Tkachev, S.I.; Department of Radiation Oncology, Mammadli, Z.Z.; Department of Colorectal Cancer, Kuzmichev, D.V.; Department of Colorectal Cancer, Aliev, V.A.; Russian Cancer Research Center, Moscow, Gordeev, S.S.; Department of Colorectal Cancer, Blagov, I.; Clinic of Abdominal Surgery, University Hospital "St. Ann", Sofia, Sechanov, I.; Clinic of Abdominal Surgery, University Hospital "St. Ann", Sofia, Katev, N.; Medical University Sofia, Goranov, N.; Medical University Sofia, Jaramov, N.; Medical University Sofia, Radionov, M.; General and endoscopic surgery clinic, University hospital "Saint Anna" Sofia, Shirouzu, K.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Kinugasa, T.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Akagi, Y.; Kurume University Faculty of Medicine, Kurume-City, Fukuoka, Japan, Damianov, N.; Military medical academy -Sofia, Ward of coloproctology, Iliev, S.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Tonchev, P.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Presolski, I.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Grozev, V.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Filipov, F.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Mirochnik, P.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Raycheva, W.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Ristovski, I.; I-st Surgical Clinic, Department septic surgery - University Hospital "Dr. George Stransky" - Pleven, Hristova, V.; Military medical academy -Sofia, Ward of coloproctology, Yaramov, N.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Sokolov, M.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Petrov, B.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Pavlov, V.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Grozdev, K.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Melnikov, V.; Medical University of Sofia, University Hospital" Alexandrovska", Sofia, Presolski, I.; I-st Surgical Clinic, Department of septic surgery - University Hospital "Dr. George Stransky" - Pleven, Kyosev, V.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Vasilev, K.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Ivanov, P.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Kotashev, G.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Grigorov, G.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Hristov, D.; Military Medical Academy, Clinic of Endoscopic surgery, Sofia, Bulgaria, Barsukov, Y.A.; Department of Colorectal Cancer, Tkachev, S.I.; Department of Radiation Oncology, Mammadli, Z.Z.; Department of Colorectal Cancer, Kuzmichev, D.V.; Department of Colorectal Cancer, Aliev, V.A.; Russian Cancer Research Center, Moscow, and Gordeev, S.S.; Department of Colorectal Cancer