Paris:  Emerging from an extended, drug-induced coma, like the one Michael Schumacher was placed in after a ski accident, could take several days or not happen at all, medical experts say.Doctors started on Thursday to try and coax the Formula One legend out of an artificial deep sleep he has placed in after a near-fatal ski fall in December.After a progressive reduction of the sedative dose, it can take several more days for the last drug traces in a patient's system to disappear, according to Gerard Audibert, a neurosurgeon at the University Hospital in Nancy, eastern France."There is a grey zone (between wake and sleep) that lasts several days, but it varies from one patient...
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