Received: 10 December 2019
Accepted: 12 October 2020
First Online: 28 November 2020
Ethics approval and consent to participate
: The need for approval for this study was waived by the Ethics committees at Assiut, Kiel, and Martin-Luther universities and Al Qassimi Hospital, based on its retrospective nature.
: Done and approved.
: The authors declare that they have no competing interests.