?url_ver=Z39.88-2004&rft_id=doi%3A10.2196%2Fpreprints.33301&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Herrera+Montano%2C+Isabel&rft.aulast=Herrera+Montano&rft.aufirst=Isabel&rft.date=Septiembre+2021&rft.title=JMIR+Preprints&rft.atitle=Analysis+of+mobile+apps+for+information%2C+prevention+and+monitoring+of+covid-19+and+proposal+of+an+innovative+app+in+this+field&rft.genre=article