Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Olga Kaniskina
Table title:
International competitions
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Competition </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > Position </th><th colspan=1 rowspan=1 > Event </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <th colspan=6 rowspan=1 > Representing Russia </th></tr>
<tr> <td colspan=1 rowspan=1 > 2005 </td><td colspan=1 rowspan=1 > European U23 Championships </td><td colspan=1 rowspan=1 > Erfurt, Germany </td><td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:33:33 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > 2006 </td><td colspan=1 rowspan=1 > World Race Walking Cup </td><td colspan=1 rowspan=1 > A Coruña, Spain </td><td colspan=1 rowspan=1 > 5th </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:28:59 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > European Championships </td><td colspan=1 rowspan=1 > Gothenburg, Sweden </td><td class="highlighted"  colspan=1 rowspan=1 > 2nd </td><td class="highlighted"  colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:28:35 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > 2007 </td><td colspan=1 rowspan=1 > European Race Walking Cup </td><td colspan=1 rowspan=1 > Leamington Spa, Great Britain </td><td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:28:13 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > World Championships </td><td colspan=1 rowspan=1 > Osaka, Japan </td><td class="highlighted"  colspan=1 rowspan=1 > 1st </td><td class="highlighted"  colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:30:09 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > 2008 </td><td colspan=1 rowspan=1 > World Race Walking Cup </td><td colspan=1 rowspan=1 > Cheboksary, Russia </td><td colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:25:42 CR </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Olympic Games </td><td class="highlighted"  colspan=1 rowspan=1 > Beijing, China </td><td class="highlighted"  colspan=1 rowspan=1 > 1st </td><td class="highlighted"  colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:26:31 OR </td></tr>
<tr> <td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=1 > World Championships </td><td colspan=1 rowspan=1 > Berlin, Germany </td><td colspan=1 rowspan=1 > DQ </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:28:09 DQ (Doping) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > European Championships </td><td colspan=1 rowspan=1 > Barcelona, Spain </td><td colspan=1 rowspan=1 > DQ </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:27:44 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2011 </td><td colspan=1 rowspan=1 > World Championships </td><td colspan=1 rowspan=1 > Daegu, South Korea </td><td colspan=1 rowspan=1 > DQ </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:29:42 DQ (Doping) </td></tr>
<tr> <td colspan=1 rowspan=1 > 2012 </td><td colspan=1 rowspan=1 > Olympic Games </td><td colspan=1 rowspan=1 > London, United Kingdom </td><td colspan=1 rowspan=1 > DQ </td><td colspan=1 rowspan=1 > 20 km </td><td colspan=1 rowspan=1 > 1:25:09 DQ (Doping) </td></tr>
</table>
Question:
What competitions did Olga Kaniskina win the gold medal?
Answer:
Olga Kaniskina won the the gold medal at the 2007 World Championships, and the 2008 World Race Walking Cup and the 2008 Beijing Olympics.