1. From the Department of Neurosurgery, NeuroCenter, Kuopio University Hospital, Finland (H.A., V.L., J. Huttunen, T.S., A.L., J.F., M.F., T.K., J.E.J., T.J.H.); Department of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas (V.S.B., S.G.A., B.G.W.); and Department of Neurosurgery, Helsinki University Hospital, Finland (J. Hernesniemi).