Nappo, Gennaro, et al. “The Dissection of Para-Aortic Lymph-Nodes During Pancreaticoduodenectomy for Cancer and Its Prognostic Value”. JOP. Journal of the Pancreas, vol. 14, no. 5S, Sept. 2013, p. 584, doi:10.6092/1590-8577/1702.