title: A 3-tier classification of cerebral arteriovenous malformations. Clinical article.
authors.affiliation: Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA.
authors.forename: Robert F
authors.initials: RF
authors.lastname: Spetzler
authors.forename: Francisco A
authors.initials: FA
authors.lastname: Ponce