Authors’ Response to Letter: Validation of Multiparametric Ultrasonography Criteria with Digital Subtraction Angiography in Carotid Artery Disease: A Prospective Multicenter Study - Barlinn, Kristian; Gahn, Georg; Krogias, Christos; Mudra, Harald; Alexandrov, Andrei V.; Weiss, Norbert; Puetz, Volker (Ultraschall in der Medizin - European Journal of Ultrasound, 2019)