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 |