RT Journal Article SR Electronic T1 Carcinoma in the fourth part of the duodenum JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP E69 OP E70 VO 52 IS 3 A1 Sampath P. Kumar A1 Addala Pavan Kumar YR 2009 UL http://canjsurg.ca/content/52/3/E69.abstract