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The geographical distribution of respondents' locations in the reviewed studies.
| Location | Numbers of studies |
|---|---|
| Countries | |
| USA | 6 |
| Spain | 4 |
| Italy | 3 |
| UK | 3 |
| Australia | 1 |
| China | 1 |
| Mexico | 1 |
| Peru | 1 |
| Poland | 1 |
| Portugal | 1 |
| Turkey | 1 |
| Six European countries | 1 |
| Others | |
| Online survey | 1 |
| Total | 25 |
