?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Kummervold%2C+Per+E&rft.aufirst=Per+E&rft.aulast=Kummervold&rft.date=October+2021&rft.issue=10&rft.issn=2291-9694&rft.atitle=Categorizing+Vaccine+Confidence+With+a+Transformer-Based+Machine+Learning+Model%3A+Analysis+of+Nuances+of+Vaccine+Sentiment+in+Twitter+Discourse&rft.title=JMIR+Medical+Informatics&rft.volume=9&rft.genre=article