HIGHLIGHTS
- who: Alice Mannocci and collaborators from the Department of Medicine and Surgery, University of Perugia, Perugia, Italy have published the article: Quadrivalent Vaccines for the Immunization of Adults against Influenza: A Systematic Review of Randomized Controlled Trials, in the Journal: (JOURNAL) of 30/03/2021
- what: Subsequently, 11 articles were excluded because of the following reasons: six
- how: Most of the studies were conducted in the USA (11 45.8%) five (19.2%) in Germany four (15.4%) in South Korea and in Canada and two (7.7%) in Finland the 5 of . . .

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