| Author |
% |
Country |
|
| Ristanovic et al, 2007 |
15.6 |
Serbia |
| Arruda et al, 2007 |
38.3 |
Brazil |
| Mohammed et al, 2007 |
10.4 |
Kuwait |
| Chernykh et al, 2006 |
7.5 |
Russia |
| Fernández-Salgado et al,
2006 |
3.4 |
Venezuela |
| Isidoro-Garcia et al, 2005 |
13 |
Spain |
| Vicdan et al, 2004 |
9.1 |
Turkey |
| El Awady et al, 2004 |
12 |
Egypt |
| Peterlin et al, 2002 |
4.4 |
Slovenia |
| Van Landuyt et al, 2000 |
3.9 |
Belgium |
| Kleiman et al, 1999 |
6 |
Israel |
| Kim et al, 1999 |
20 |
Korea |
| Brandell et al, 1998 |
7.7 |
United States |
| Silber et al, 1998 |
17.2 |
United States |
|