Inclusion and Exclusion Criteria

Parameters

Inclusion criteria

Exclusion criteria

Population

Older adults aged or greater than 60 years old

People who aged less than 60 years old

Phenomenon

Studies related to perceptions/attitude/opinion/feel of flu vaccination

Studies related to knowledge/statistic of flu vaccination

Methodology

Qualitative studies/Mixed methods with qualitative methods

Quantitative studies

Language

Published in English

Non-English papers without a professional interpretation

The geographical location of research

Worldwide

Not applicable

Publication date

Between 2011 and 2021

Before 2011

Types of research

Primary studies

Book review, opinion essay, review essay, and so on