[1] Natl Inst Geriatr Rheumatol & Rehabil, Dept Radiol, Warsaw, Poland
[2] Warsaw Med Univ, Dept Diagnost Imaging, Warsaw, Poland
[3] Univ Padua, Reg Hosp, Div Gen Surg 4, Tertiary Referral Pelv Floor Ctr, Piazzale Osped 1, I-31100 Treviso, Italy
[4] St Elizabeth Hosp, Dept Proctol, Warsaw, Poland
[5] Queen Mary Univ London, Natl Bowel Res Ctr, London, England