Funding for this research was provided by:
Medical Scientific fund of the Mayor of the City of Vienna (COVID054)
Received: 22 October 2021
Accepted: 28 December 2021
First Online: 10 January 2022
: The local ethics committee approved the study (#1520/2020).
: Not applicable.
: CK, JG, KT, MK, VF, MN, SN, KH, WS, HH and DR report no competing interests.