1 From the Department of Neurologic Surgery (J.R., R.K., C.L.N., W.E.K.), Department of Pathology (C.G.), and Department of Neurology (W.O.T.), Mayo Clinic, Rochester, MN.
2 From the Department of Neurologic Surgery (J.R., R.K., C.L.N., W.E.K.), Department of Pathology (C.G.), and Department of Neurology (W.O.T.), Mayo Clinic, Rochester, MN. tobin.oliver@mayo.edu.