title: Reply.
authors.affiliation: Department of Interventional Neuroradiology Stanford University Medical Center Stanford, California.
authors.forename: J J
authors.initials: JJ
authors.lastname: Heit
authors.affiliation: Department of Interventional Neuroradiology Massachusetts General Hospital Boston, Massachusetts.
authors.forename: J D
authors.initials: JD
authors.lastname: Rabinov