Mobile Apps for the Management of Gastrointestinal Diseases: Systematic Search and Evaluation Within App Stores. - Messner, Eva-Maria; Sturm, Niklas; Terhorst, Yannik; Sander, Lasse B; Schultchen, Dana; Portenhauser, Alexandra; Schmidbaur, Simone; Stach, Michael; Klaus, Jochen; Baumeister, Harald; Walter, Benjamin M (Journal of Medical Internet Research, 2022)