Bertoldo G, Pesce A, Pepe A, Pelullo CP, Di Giuseppe G, The Collaborative Working Group (2019) Seasonal influenza: Knowledge, attitude and vaccine uptake among adults with chronic conditions in Italy. PLoS ONE 14(5): e0215978. https://doi.org/10.1371/journal.pone.0215978

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215978