1 The Johns Hopkins University Applied Physics Lab (APL), Health Technologies, National Health Mission Area, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA.
2 2Department of Neurology, The Johns Hopkins Hospital, 1800 Orleans Street, Baltimore, MD 21287 USA.
3 3Division of Cardiology, Department of Medicine, The Johns Hopkins Hospital, 600 N. Wolfe Street, Baltimore, MD 21287 USA.