1. Department of Surgical Sciences; Uppsala University; Uppsala University Hospital; Uppsala; Sweden
2. Department of Radiation Oncology; Jewish General Hospital; McGill University; Montreal; Quebec; Canada
3. Department of Colo-rectal Surgery; Montreal University; Montreal; Quebec; Canada
4. Department of Colo-rectal Surgery; McGill University Health Center; McGill University; Montreal; Quebec; Canada
5. Hospital Pierre Boucher; Longueil; Quebec; Canada