Leveraging Influencers to Reach and Engage Vulnerable Individuals With a Digital Health Intervention: Quasi-Experimental Field Study

Marcia Nißen   ^{1, 2, 3, 4} , PhD ;   Samira Harperink   ^{1, 2, 5} , MA ;   Priyam Joshi   ^{2, 6} , MPH ;   Anja Yvonne Bischof   ^{1, 2} , PhD ;   Theresa Schachner   ^{2, 4} , PhD ;   Yanick Xavier Lukic   ^{1, 2, 7, 8} , PhD ;   Fabian Schneider   ^{2, 9} , BSc ;   Prabhakaran Santhanam   ^{2, 10} , MSc ;   Florian v Wangenheim   ^{2, 4} , Dr (Rer Pol) ;   Joseph Ollier   ^{2, 4, 11} , PhD ;   Tobias Kowatsch   ^{1, 2, 3} , PhD

¹ Digital Health Interventions, School of Medicine, University of St. Gallen, St.Gallen, Switzerland

² Centre for Digital Health Interventions, University of Zurich, ETH Zurich, University of St.Gallen, Zurich, Switzerland

³ Institute for Implementation Science in Health Care, University of Zurich, Zurich, Switzerland

⁴ Chair of Technology Marketing, Department of Management, Technology, and Economics, ETH Zurich, Zurich, Switzerland

⁵ PwC Switzerland, Zurich, Switzerland

⁶ Department of Psychology, Georgia State University, Atlanta, United States

⁷ Institute of Computer Science, School of Engineering, ZHAW Zurich University of Applied Sciences, Winterthur, Switzerland

⁸ Codeklang GmbH, Bülach, Switzerland

⁹ Byldr GmbH, Schlieren, Switzerland

¹⁰ Datahouse AG, Zurich, Switzerland

¹¹ Mobiliar Lab for Analytics, Department of Management, Technology, and Economics, ETH Zurich, Zurich, Switzerland