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| Countries (n = 51) | Year | Total publications (TP) | Total citations (TC) | Citation Impact (TC/TP) |
|---|---|---|---|---|
| USA | 1988 | 96 | 1,735 | 18.07 |
| UK | 1991 | 83 | 625 | 7.53 |
| Australia | 1998 | 36 | 210 | 5.83 |
| India | 1998 | 21 | 53 | 2.52 |
| Peoples R China | 2010 | 18 | 64 | 3.56 |
| Italy | 2000 | 17 | 119 | 7.00 |
| Germany | 1998 | 10 | 53 | 5.30 |
| Canada | 2005 | 10 | 42 | 4.20 |
| Japan | 2002 | 7 | 31 | 4.43 |
| Netherlands | 2003 | 6 | 77 | 12.83 |
