|
| Google Scholar + University LibSearch |
| Key words in the titles | 285 |
| Studies published after 2000 | 285 |
| Unique Sources | 227 |
| Articles | 194 |
| Peer reviewed research articles | 156 |
| Relevant articles | 135 |
| Articles having clear and strong abstracts | 125 |
| Articles containing sufficient methodology, participants and data analysis info | 56 |