What type of details about matthias witthaus can be gathered from the following bio? Bio: matthias witthaus -lrb- born october 11 , 1982 in oberhausen -rrb- is a field hockey player from germany , who was a member of the men 's national team that won the bronze medal at the 2004 summer olympics in athens , greece and the gold medal at the 2008 summer olympics in beijing and again at the 2012 summer olympics .
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