From the University Clinic Essen and the German Cancer Research Center (DKFZ), Essen, Germany.
Received for publication March 28, 2019; and accepted for publication, after revision, Apr 19, 2019.
Conflicts of interest and sources of funding: none declared.
Correspondence to: Alexander Radbruch, MD, JD, University Clinic Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Hufelandstraße 55, 45147 Essen, Germany. E-mail: email@example.com.
Online date: June 19, 2019