| Characteristic | Study author contacted | Study author replied | Study author asked for additional information | Study author provided data |
| Ludvik 2002 | Y | N | N/A | N/A |
| Ludvik 2004 | Y | N | N/A | N/A |
| Ludvik 2008 | Y | N | N/A | N/A |
|
Footnotes N: no; N/A: not applicable; Y: yes | ||||
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