1. Bispebjerg Hospital, building 11B; Colorectal Cancer Group; 23 Bispebjerg Bakke Copenhagen NV Denmark DK 2400
2. Bispebjerg Hospital; Surgical dept. K; Bispebjerg Bakke 23 Copenhagen NV Denmark 2400
3. Roskilde Hospital; Surg. Department A; Køgevej 7-13 Roskilde Denmark DK 4000
4. Bispebjerg Hospital; Department of Surgical Gastroenterology K; Bispebjerg Bakke 23 Copenhagen NV Denmark DK-2400
5. University of Padova; Meta-Analysis Unit, Department of Oncological & Surgical Sciences; Via Giustiniani 2 Padova Veneto Italy 35128