1 Center for Cerebrovascular Research, University of California, San Francisco, San Francisco, CA, USA.
2 Department of Anesthesia and Perioperative Care, University of California, San Francisco, 1001 Potrero Avenue, Box 1363, San Francisco, CA, USA.
3 Center for Cerebrovascular Research, University of California, San Francisco, San Francisco, CA, USA. [email protected].
4 Department of Anesthesia and Perioperative Care, University of California, San Francisco, 1001 Potrero Avenue, Box 1363, San Francisco, CA, USA. [email protected].