The CASANOVA StudyImmediate Surgery Versus Delayed Surgery for Moderate Carotid Artery Stenosis?Dlener, H. C. MDSchäfer, H. PhDAuthor informationDepartment of Neurology University of Essen, Biometric Centre for Clinical Trials University of Heidelberg Federal Republic of GermanyStroke 23(6):p 918-919, June 1992.Copyright © 1992 American Heart Association, Inc.