Occipitoatlantal InstabilityA Hemodynamic Cause of Vertebrobasilar Ischemia After Neck MotionAnzola, Gian Paolo MDFrisoni, Giovanni B. MSAuthor informationClinica Neuwlogica Università di Brescia Spedali Civili Brescia, ItalyStroke 23(6):p 921, June 1992.Copyright © 1992 American Heart Association, Inc.