Received: 19 October 2020
Accepted: 24 February 2021
First Online: 8 April 2021
: The retrospective study was performed following the revised principles stated in the Declaration of Helsinki and the Good Clinical Practice Guidelines. This retrospective study is exempt from institutional review board approval by the State Medical Council of Baden-Würrtemberg, Germany. All patients gave their written informed consent for inclusion before they participated in the study.
: All patients gave their written informed consent for publication of this study.
: Babak Saravi, Andreas Vollmer, Gernot Lang, Nicholai Adolphs, Zhen Li, Verena Giers and Peter Stoll declare that they have no competing interests.