Outcomes of Adjuvant Radiation Therapy and Lymph Node Dissection in Pancreatic Cancer: A SEER Analysis - Mellon, E.; Springett, G.M.; Chuong, M.D.; Weber, J.; Hodul, P.; Malafa, M.P.; Hoffe, S.E.; Shridhar, R. (International Journal of Radiation Oncology, Biology, Physics, 2012)