- Correspondence to Nasrine Bendjilali, Department of Mathematics, Rowan University, Glassboro, New Jersey, USA; and Helen Kim, UCSF Center for Cerebrovascular Research, 1001 Potrero Avenue, Box 1363, San Francisco, CA 94110, USA;
- Received July 31, 2013
- Revised January 3, 2014
- Accepted March 18, 2014
- First published April 28, 2014.
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