Funding for this research was provided by:
Received: 26 October 2020
Accepted: 22 January 2021
First Online: 10 February 2021
Ethics approval and consent to participate
: The institutional review board of the LMU Munich in Germany (Ethikkommission der Medizinischen Fakultät der Ludwig-Maximilians-Universität München) approved this observational prospective study, which was conducted according to the Declaration of Helsinki, and waived requirement for informed consent.
: Not applicable.
: The authors declare that they have no competing interests.