Effects of Scalable, Wordless, Short, Animated Storytelling Videos on Flu Vaccine Hesitancy in China: Nationwide, Single-Blind, Parallel-Group, Randomized Controlled Trial

Wenjin Chen   ^{1, 2 *} , PhD ;   Lirui Jiao   ^{3 *} , PhD ;   Qiushi Chen   ^{4 *} , PhD ;   Zhoutao Zheng   ¹ , PhD ;   Pascal Geldsetzer   ^{5, 6} , PhD ;   Merlin Greuel   ² , MD ;   Jennifer Gates   ⁷ , MD ;   Jinghan Zhao   ^{1, 2} , PhD ;   Till Bärnighausen   ^{2, 6, 8, 9} , PhD ;   Maya Adam   ^{2, 10, 11} , MD, PhD ;   Simiao Chen   ^{1, 2} , PhD ;   Chen Wang   ¹ , MD

¹ School of Population Medicine and Public Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

² Heidelberg Institute of Global Health, Heidelberg University, Heidelberg, Germany

³ Department of Health Policy and Management, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States

⁴ The Harold and Inge Marcus Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, Pennsylvania, PA, United States

⁵ Department of Medicine, Stanford University, California, CA, United States

⁶ Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, MA, United States

⁷ Icahn School of Medicine, New York, NY, United States

⁸ Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China

⁹ Africa Health Research Institute, KwaZulu-Natal, South Africa

¹⁰ Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA, United States

¹¹ Center for Digital Health, School of Medicine, Stanford University, Stanford, CA, United States

*these authors contributed equally