Institution: | (1) Department of Anesthesia, University of Pennsylvania, 305 Morgan, 3620 Hamilton Walk, Philadelphia, PA 19104-6112, USA;(2) Biostatistics Analysis Center, University of Pennsylvania, Philadelphia, PA 19104, USA;(3) Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104, USA;(4) Cardiovascular Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA;(5) Department of Neurology, University of Michigan, Ann Arbor, MI, USA |