December 29 will mark the third anniversary of the accident in Meribel, France but Schumacher's family and close associates have kept his condition largely secret.
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The 47-year-old German is said to be recovering at his Swiss home, but his condition remains a mystery.
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"Michael's health is not a public issue so we will not comment on it, just because we need to protect the privacy of Michael as much as possible," said his manager Sabine Kehm.
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"We are aware that this is difficult to understand for some people, but we are in perfect agreement with Michael's attitude and we can only give our thanks for showing understanding."
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The Schumacher family are setting up the "Keep Fighting" initiative to thank fans for their continued support of the seven-time Formula One world champion.
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"We want to encourage others to never give up, the initiative is another sign of respect and thanks to Michael's fans," said Schumacher's wife Corinna.
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