Kloft, Maximilian, Sandra Geurts, Margreet van Putten, and Judith de Vos-Geelen. 2017. “Proximal Esophageal Cancer: Prevalence of Previous Tumors and Their Influence on Survival”. Student Undergraduate Research E-Journal! 3 (December):237-40. https://doi.org/10.25609/sure.v3.2543.