PLoS One
http://www.plosone.org/
[Accessed 4 May 2019]

Seasonal influenza: Knowledge, attitude and vaccine uptake among adults with chronic conditions in Italy
Gaia Bertoldo, Annalisa Pesce, Angela Pepe, Concetta Paola Pelullo, Gabriella Di Giuseppe, The Collaborative Working Group
Research Article | published 01 May 2019 PLOS ONE
https://doi.org/10.1371/journal.pone.0215978