1. From the Department of Neurosurgery (N.E., K.B., H.-J.S., D.H.) and Institute of Forensic Medicine (C.M.), Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany; Institute for Physiological Chemistry and Pathobiochemistry, Westfalian Wilhelms-University, Münster, Germany (R.D., P.B.); Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, CA (B.A.B.); Department of Epidemiology, University of Iowa (J.C.T.); Department of Neurology, Mayo Clinic, Rochester, MN (R.D...