Table 1 Studies by country of publication
| Country | Number |
|---|---|
| USA | 30 |
| Spain | 17 |
| Australia | 8 |
| Denmark | 4 |
| UK | 3 |
| New Zealand | 2 |
| China | 2 |
| Canada | 2 |
| Turkey | 1 |
| Czech Republic | 1 |
| Brazil | 1 |
| France | 1 |
| Norway | 1 |
| The Netherlands | 1 |
| Hong Kong | 1 |
| Mexico | 1 |
| Greece | 1 |
| Sweden | 1 |
| Argentina | 1 |
| Germany | 1 |
| Taiwan | 1 |
| Nigeria | 1 |