Testing the Effectiveness of an Animated Decision Aid to Improve Recruitment of Control Participants in a Case-Control Study: Web-Based Experiment

Sandro T Stoffel   ^{1, 2} , MSc, PhD ;   Jing Hui Law   ^{1, 3} , MSc, MRes ;   Robert Kerrison   ^{1, 4} , MSc, PhD ;   Hannah R Brewer   ⁵ , MSc, PhD ;   James M Flanagan   ⁵ , BSc, PhD ;   Yasemin Hirst   ^{1, 5} , MSc, PhD

¹ Department of Behavioural Science and Health, University College London, London, United Kingdom

² Institute of Pharmaceutical Medicine, University of Basel, Basel, Switzerland

³ Wolfson Institute of Population Health, Queen Mary University of London, London, United Kingdom

⁴ School of Health Sciences, University of Surrey, Guildford, United Kingdom

⁵ Department of Surgery and Cancer, Imperial College London, London, United Kingdom