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Regional distribution of the articles considered in the present study.
| Region | Number of Articles | % | Countries (n, %) |
|---|---|---|---|
| Asia | 4 | 19.0 | Sri Lanka (n = 2, 9.5%); Lebanon and China (n = 1 each, 4.8%) |
| Europe | 3 | 14.3 | France, England, and Spain (n = 1 each, 4.8%) |
| North America | 14 | 66.7 | United States (n = 11, 52.4%); Canada (n = 2, 9.5%); Mexico (n = 1, 4.8%) |
| Total | 21 | 100 | 10 countries in total |
Note: There were no studies conducted in Africa nor in South America.
