Received: 12 April 2021
Revised: 20 August 2021
Accepted: 23 August 2021
First Online: 14 October 2021
: T. Pätz, K. Stelzig, R. Pfeifer, H. Thiele, H.-J. Busch, T. Stiermaier, I. Eitel and S. Wolfrum declare that they have no competing interests.
: Anonymized data were transmitted into the registry with approval by the local ethic committees.