Ohtsubo, Koushiro, Hiroyuki Watanabe, Hisatsugu Mouri, Kaname Yamashita, Kazuo Yasumoto, and Seiji Yano. 2012. “Endoscopic Findings of Upper Gastrointestinal Lesions in Patients With Pancreatic Cancer”. JOP. Journal of the Pancreas 13 (4):420-26. https://doi.org/10.6092/1590-8577/749.