Table 1.
Country/region and number of published articles.
| Country/Region | No. of Articles | Percentage | Frequency of Citations | Centrality | Year of First Publication |
|---|---|---|---|---|---|
| USA | 156 | 36.195% | 2987 | 0.2 | 2006 |
| Australia | 37 | 8.585% | 456 | 0.26 | 2011 |
| Peoples R China | 37 | 8.585% | 152 | 0.16 | 2015 |
| Germany | 32 | 7.425% | 390 | 0.14 | 2014 |
| South Korea | 21 | 4.872% | 226 | 0.05 | 2012 |
| Canada | 19 | 4.408% | 1119 | 0.1 | 2006 |
| Denmark | 18 | 4.176% | 160 | 0.06 | 2017 |
| England | 16 | 3.712% | 202 | 0.15 | 2016 |
| Netherlands | 16 | 3.712% | 544 | 0.07 | 2011 |
| Chinese Taiwan | 15 | 3.480% | 188 | 0.01 | 2014 |