Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year Location | Mens Singles | Womens Singles | Mens Doubles | Womens Doubles |
| --- | --- | --- | --- | --- |
| 2012 Velenje | Zhang Jike | Ding Ning | Ma Long Zhang Jike | Ding Ning Guo Yan |
| 2011 Velenje | Xu Xin | Wu Yang | Wang Hao Zhang Jike | Guo Yue Li Xiaoxia |
| 2010 Velenje | Lee Sang-Su | Li Qian | Alexander Shibaev Alexey Smirnov | Viktoria Pavlovich Svetlana Ganina |
| 2009 Velenje | Hao Shuai | Cao Zhen | Xu Xin Zhang Chao | Cao Zhen Fan Ying |
| 2008 Velenje | Vladimir Samsonov | Li Jiao | Chang Yen-Shu Chiang Peng-Lung | Irina Kotikhina Li Jie |
| 2007 Velenje | Wang Hao | Guo Yue | Chen Qi Wang Liqin | Guo Yan Zhang Yining |
| 2006 Velenje | Wang Hao | Guo Yue | Hao Shuai Ma Long | Guo Yue Li Xiaoxia |
Question:
Who was the womens double winner when the womens singles winner was Ding Ning?
Answer:
Ding Ning Guo Yan