1 University of Pittsburgh Medical Center Stroke Institute, Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh 15213, PA, USA. Electronic address: nogueirarg@upmc.edu.
2 University of Pittsburgh Medical Center Stroke Institute, Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh 15213, PA, USA.
3 Marcus Stroke and Neuroscience Center, Grady Memorial Hospital, Emory University, Atlanta, GA, USA.
4 Department of Neuroradiology, Heidelberg University Hospital, Germany.
5 Department of Neurology and Radiology, Boston Medical Center, Boston University School of Medicine, Boston, MA, USA.
6 Department of Neurology, The First Affiliated Hospital of the University of Science and Technology of China, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.