Are Conversational Agents Used at Scale by Companies Offering Digital Health Services for the Management and Prevention of Diabetes? - Roman Keller; Jiali Yao; Gisbert W. Teepe; Sven Hartmann; Kim-Morgaine Lohse; Florian von Wangenheim; Falk Müller-Riemenschneider; Jacqueline Louise Mair; Tobias Kowatsch (HEALTHINF, 2021)