GRENOBLE, FRANCE - JANUARY 03: A Ferrari flag flies outside the Grenoble University Hospital Centre where former German Formula One driver Michael Schumacher is being treated for a severe head injury following a skiing accident on January 3, 2014 in Grenoble, France. Fans gathered outside the hospital to mark Schumacher's 45th birthday, five days after the former driver suffered a serious head injury whilst skiing off-piste. He is currently in a medically induced coma and it is reported that his condition remains critical. (Photo by Micha Will/Bongarts/Getty Images)