This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. It includes data and figures from patients that were cared for by Dr. Malek at the Cerebrovascular Hemodynamics laboratory in the Department of Neurosurgery at Tufts Medical Center. The Editor-in-Chief has been informed by Tufts Medical Center that the authors of the paper did not have clinical privileges for these patients and played no clinical role in their care.
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