Table 2 The top 11 active countries/regions
Rank | Country/Region | Publications | Centrality | First Year |
|---|---|---|---|---|
1 | USA | 213 | 0.1 | 1999 |
2 | ENGLAND | 107 | 0.17 | 1998 |
3 | ITALY | 92 | 0.13 | 2001 |
4 | FRANCE | 90 | 0.15 | 1998 |
5 | GERMANY | 88 | 0.04 | 1997 |
6 | PEOPLES R CHINA | 61 | 0.04 | 2012 |
7 | JAPAN | 57 | 0.01 | 2005 |
8 | NETHERLANDS | 51 | 0.09 | 2007 |
9 | SPAIN | 49 | 0.2 | 1998 |
10 | CANADA | 45 | 0.07 | 2008 |
11 | SWITZERLAND | 35 | 0.13 | 2005 |