title: Response to Letter Regarding Article, "Optical Bedside Monitoring of Cerebral Blood Flow in Acute Ischemic Stroke Patients During Head-of-Bed Manipulation".
authors.affiliation: Institute of Physics, University of Campinas, São Paulo, Brazil.
authors.forename: Rickson C
authors.initials: RC
authors.lastname: Mesquita
authors.affiliation: Department of Neurology, University of Pennsylvania, Philadelphia.
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Favilla
authors.affiliation: Department of Physics and Astronomy, University of Pennsylvania, Philadelphia.
authors.forename: Arjun G
authors.initials: AG
authors.lastname: Yodh
authors.affiliation: Department of Neurology, University of Pennsylvania, Philadelphia.
authors.forename: John A
authors.initials: JA
authors.lastname: Detre
mesh_terms: D001921:Brain / Q000098:blood supply*; D002545:Brain Ischemia / Q000503:physiopathology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D020521:Stroke / Q000503:physiopathology*