Ceppa EP, Roch AM, Cioffi JL, Sharma N, Easler JJ, DeWitt JM, House MG, Zyromski NJ, Nakeeb A, Schmidt CM. Invasive, mixed-type intraductal papillary mucinous neoplasm: superior prognosis compared to invasive main-duct intraductal papillary mucinous neoplasm. Surgery. 2015 Oct; 158(4):937-44; discussion 944-5.