Wayne, E., Miller, R. E., & Eiseman, B. (1971). Duodenal obstruction by the superior mesenteric artery in bedridden combat casualties. Annals of Surgery, 174(3), 339–345. 

            Notes: Case report of five patients bedridden with combat injuries diagnosed with SMAS. In case one, surgery was successful, and in cases two through five, conservative treatment with repositioning and high calorie feeds was successful. Includes chart of SMA angle measurements. Link: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1397584/pdf/annsurg00392-0011.pdf