Markus Zimmermann, Maximilian Schulze-Hagen, Federico Pedersoli, Peter Isfort, Christiane Kuhl, Philipp Bruners, Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen 52074, Germany
Alexander Heinzel, Department of Nuclear Medicine, RWTH Aachen University Hospital, Pauwelsstrasse 30, Aachen 52074, Germany
Author contributions: Zimmermann M, Schulze-Hagen M, Isfort P, Kuhl C and Bruners P contributed to study conception and design; Zimmermann M, Pedersoli F and Heinzel A contributed to data acquisition, data analysis and interpretation, and writing of article; Zimmermann M, Schulze-Hagen M, Pedersoli F, Heinzel A, Isfort P, Kuhl C and Bruners P contributed to editing, reviewing and final approval of article.
Institutional review board statement: Approval for this retrospective study was granted by the institutional review board, internal reference number: EK 308/18.
Informed consent statement: The need for informed consent was waived by the institutional review board due to the retrospective study design and use of fully anonymized patient data.
Conflict-of-interest statement: On behalf of all authors, the corresponding author states that there is no conflict of interest.
Data sharing statement: No additional data are available.
STROBE statement: The authors have read the STROBE Statement-checklist of items, and the manuscript was prepared and revised according to the STROBE Statement-checklist of items.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Corresponding author: Markus Zimmermann, MD, Attending Doctor, Department of Diagnostic and Interventional Radiology, University Hospital RWTH Aachen, Pauwelsstr 30, Aachen 52074, Germany. firstname.lastname@example.org
Telephone: +49-241-8037443 Fax: +49-241-8082411
Received: May 8, 2019
Peer-review started: May 10, 2019
First decision: June 6, 2019
Revised: July 3, 2019
Accepted: July 25, 2019
Article in press: July 25, 2019
Published online: July 28, 2019