Kobayashi 2021.

Study characteristics
Methods	Study design: cross‐sectional survey study Type of publication: preprint Setting and dates: LINE messenger app, between April 5–12, 2021 Country: Japan Language: English
Interventions	Corowa‐kun: a COVID‐19 vaccine information chatbot in a popular messenger app in Japan that answers commonly asked questions
Population	Age; median (range): 55 years (16–97) Gender: Female 74%, Male 26% Ethnicity: NR Number of participants (recruited/allocated/evaluated): 10,192 Inclusion/exclusion criteria: NR
Outcomes	Primary outcome: COVID‐19 vaccine hesitancy
Notes	COI: none declared Funding:none