Methods for Authenticating Participants in Fully Web-Based Mobile App Trials from the iReach Project: Cross-sectional Study

Jodie L Guest   ^{1, 2} , MPH, PhD ;   Elizabeth Adam   ¹ , MPH ;   Iaah L Lucas   ¹ , MPH ;   Cristian J Chandler   ¹ , MPH, PhD ;   Rebecca Filipowicz   ¹ , MPH, MS ;   Nicole Luisi   ¹ , MPH, MS ;   Laura Gravens   ¹ , MPH, PMP, MS ;   Kingsley Leung   ¹ , MS ;   Tanaka Chavanduka   ³ , MPH ;   Erin E Bonar   ^{3, 4, 5} , PhD ;   Jose A Bauermeister   ⁶ , MPH, PhD ;   Rob Stephenson   ^{3, 7} , MA, MSc, PhD ;   Patrick S Sullivan   ¹ , DVM, PhD

¹ Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, United States

² School of Medicine, Emory University, Atlanta, GA, United States

³ Center for Sexuality and Health Disparities, University of Michigan, Ann Arbor, MI, United States

⁴ Department of Psychiatry and Addiction Center, University of Michigan, Ann Arbor, MI, United States

⁵ Injury Prevention Center, University of Michigan, Ann Arbor, MI, United States

⁶ School of Nursing, University of Pennsylvania, Philadelphia, PA, United States

⁷ Department of Systems, Population and Leadership, School of Nursing, University of Michigan, Ann Arbor, MI, United States