1. From the Departments of Neurology (R.W.R., A.B.S.), Neurosurgery (R.W.R.), and Radiology (R.G.G., J.H., M.H.L.), Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, WACC 729C, Boston, MA 02114; Athinoula A Martinos Center for Biomedical Imaging, Charlestown, Mass (R.G.G.); and Mass General Brigham Center for Clinical Data Science, Boston, Mass (R.G.G.).