title: Letter of apology.
authors.forename: Thomas
authors.initials: T
authors.lastname: Mayer
authors.forename: Gerhard
authors.initials: G
authors.lastname: Hamann
authors.forename: Hartmut
authors.initials: H
authors.lastname: Brueckmann
mesh_terms: D001488:Basilar Artery / Q000601:surgery*; D006801:Humans; D020766:Intracranial Embolism / Q000150:complications / Q000601:surgery*; D014656:Vascular Surgical Procedures / Q000295:instrumentation* / Q000379:methods*; D014715:Vertebrobasilar Insufficiency / Q000150:complications / Q000601:surgery*