MachadoN., ChopraP., Al-HaddabiI., and Al-QadhiH., “Large Duodenal Gastrointestinal Stromal Tumor Presenting with Acute Bleeding Managed by a Whipple Resection. A Review of Surgical Options and the Prognostic Indicators of Outcome”, JOP, vol. 12, no. 2, pp. 194-199, Mar. 2011.