1. From the Department of Bioengineering, Stanford University Schools of Engineering and Medicine, Stanford, Calif (S.S.D.); and Division of Neuroimaging and Neurointervention, and Stanford Initiative for Multimodality Neuro-Imaging in Translational Anatomy Research (SIMITAR), Department of Radiology, Stanford University School of Medicine, 453 Quarry Rd, MC 5659, Palo Alto, CA 94304 (B.L., T.F.M.).