Inclusion and Exclusion Criteria
| Criteria | Inclusion | Exclusion |
|---|---|---|
| Focus of the article | Graduate online education | Other levels of online education |
| Publication date | Articles published between 2000 and 2020 | Articles published before 2000 and after 2020 |
| Publication type | Publications from peer-reviewed journals | Book chapters, technical reports, dissertations, proceedings |
| Research methods | Empirical studies using quantitative, qualitative, or mixed methods | Nonempirical studies, literature reviews, systematic reviews |
| Language | Articles written in English | Articles in other languages were not included |
| Focus of the article | Graduate online education | Other levels of online education |
| Publication date | Articles published between 2000 and 2020 | Articles published before 2000 and after 2020 |
| Publication type | Publications from peer-reviewed journals | Book chapters, technical reports, dissertations, proceedings |
| Research methods | Empirical studies using quantitative, qualitative, or mixed methods | Nonempirical studies, literature reviews, systematic reviews |
| Language | Articles written in English | Articles in other languages were not included |
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