[1] Metaxa Canc Hosp, Gynaecol Oncol Dept, Piraeus, Greece
[2] Natl & Kapodistrian Univ Athens, Sch Med, Attikon Hosp, Dept Obstet & Gynaecol 3, Athens, Greece
[3] Athens Colorectal Lab, Athens, Greece
[4] Royal Devon & Exeter NHS Fdn Trust, Dept Colorectal Surg, 17c James House,Residential Village, Exeter EX2 5DS, Devon, England