Received: 7 February 2020
Accepted: 2 December 2020
First Online: 10 December 2020
Ethics approval and consent to participate
: All analyses were performed on routinely collected anonymized data from the participating institutions. Therefore, this study was exempted from medical ethics review and opt-in informed consent from participants was not necessary according to article 9 of the General Data Protection Regulation [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.