Received: 16 July 2020
Accepted: 1 February 2021
First Online: 3 March 2021
Change Date: 5 June 2021
Change Type: Update
Change Details: The funding note for this article has been updated.
Ethics approval and consent to participate
: This study was approved by the local institutional review board (Heinrich Heine University, Duesseldorf, Germany; study-no.: 2019-473-2). All procedures performed in this study were in accordance with the ethical standards in the 1964 Declaration of Helsinki and its later amendments. Informed consent was waived because no data regarding the cases were disclosed.
: Not applicable.
: The authors declare that they have no competing interests.