Received: 17 October 2020
Accepted: 28 December 2020
First Online: 20 February 2021
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: This retrospective study followed the principles of the 1964 Declaration of HELSINKI. Ethics committee approval was received for this study from the ethics committee of the Sint-Augustinus Hospital, GZA Antwerp (Study code 190305RETRO).