[1] St Vincents Univ Hosp, Ctr Colorectal Dis, Dublin, Ireland
[2] Univ Coll Dublin, Ctr Support & Training Anal & Res, Dublin, Ireland
[3] Netherlands Canc Inst, Amsterdam, Netherlands
[4] Karolinska Univ Hosp, Stockholm, Sweden
[5] Erasmus MC, Rotterdam, Netherlands
[6] St Marks Hosp, Harrow, Middx, England
[7] Royal Prince Alfred Hosp, Camperdown, NSW, Australia
[8] Singleton Hosp, Swansea, W Glam, Wales
[9] Catharina Hosp, Eindhoven, Netherlands
[10] Erlangen Hosp, Erlangen, Germany
[11] Heidelberg Univ Hosp, Heidelberg, Germany
[12] Royal Devon & Exeter Hosp, Exeter, Devon, England
[13] Aarhus Univ Hosp, Aarhus, Denmark
[14] St Orsola Malpighi Hosp, Bologna, Italy
[15] Addenbrookes Hosp, Cambridge, England
[16] Radboud Univ Nijmegen, Med Ctr, Nijmegen, Netherlands
[17] Univ Hosp Cleveland, Cleveland, OH 44106 USA
[18] Christchurch Hosp, Christchurch, New Zealand
[19] Gregorio Maranon Gen Univ Hosp, Madrid, Spain
[20] Guys & St Thomas Hosp, London, England
[21] Leeds Gen Infirm, Leeds, W Yorkshire, England
[22] Peter MacCallum Canc Ctr, Melbourne, Vic, Australia
[23] Natl Canc Ctr, Tokyo, Japan
[24] Queen Mary Hosp, Hong Kong, Hong Kong, Peoples R China
[25] Cleveland Clin, Cleveland, OH 44106 USA
[26] Royal Marsden Hosp, London, England
[27] Heidelberg Univ, Heidelberg, Germany
[28] Dublin City Univ, Dublin, Ireland
[29] Skane Univ Hosp, Lund, Sweden
[30] Karolinska Univ Hosp, Stockholm, Sweden
[31] Vrije Univ Amsterdam, Med Ctr, Amsterdam, Netherlands
[32] Erasmus MC Canc Inst, Rotterdam, Netherlands
[33] Gregorio Maranon Gen Univ Hosp, Madrid, Spain