Happy = Healthier (Prof. Dr. Volker Stefanski, Interview, Süddeutsche.de - Panorama, 20.06.2016, dpa-Videokanal / ARD-Tagesthemen 29.06.2016)
The photo prints are only free of charge if a report is being written about the university.
Please use the reference: University of Hohenheim or the source mentioned below the picture