Differentiating between benign and malignant ampullary strictures: a prediction model using a nomogram based on CT imaging and clinical findings. - Lee, Ji Eun; Choi, Seo-Youn; Lee, Min Hee; Lim, Sanghyeok; Min, Ji Hye; Hwang, Jeong Ah; Lee, Sunyoung; Kim, Jung Hoon (European Radiology, 2022)