1. From the Departments of Radiology (P.M.P., A.M.D.S.), Intensive Care Medicine (H.E.D., P.G.J.), Orthopedic Surgery (F.V.), and Neurology (P.C.), Universitair Ziekenhuis Antwerpen, Edegem, Belgium, and the Departments of Neurosurgery (G.V.) and Orthopedic Surgery (F.V.), A.Z. Monica, Antwerp, Belgium.