Funding for this research was provided by:
Medizinische Hochschule Hannover (MHH)
Received: 8 November 2020
Accepted: 8 April 2021
First Online: 21 April 2021
: The ethics committees of the Faculty of Medicine of the Eberhard Karls University Tuebingen (Head Prof. Luft) and Hannover Medical School (Head Prof. Tröger) approved the study (ethics votes no. 128/2003 V and 1213–2011) and written informed consent was obtained from patients.
: Not applicable.
: The authors declare that they have no competing interests.