Informing Patients With Esophagogastric Cancer About Treatment Outcomes by Using a Web-Based Tool and Training: Development and Evaluation Study. - Water, Loïs F van de; Boorn, Héctor G van den; Hoxha, Florian; Henselmans, Inge; Calff, Mart M; Sprangers, Mirjam A G; Abu-Hanna, Ameen; Smets, Ellen M A; Laarhoven, Hanneke W M van; van de Water, Loïs F; van den Boorn, Héctor G; van Laarhoven, Hanneke W M (Journal of Medical Internet Research, 2021)