Received: 9 June 2020
Accepted: 18 December 2020
First Online: 12 January 2021
Compliance with ethical guidelines
: T.J. Gehr, C.C. Sieber, E. Freiberger and S.A. Engel declare that they have no competing interests.
: All studies on humans described in the present manuscript were carried out with the approval of the responsible ethics committee and in accordance with national law and the Helsinki Declaration of 1975 and its later amendments. Written informed consent was obtained from all individual participants included in the study prior to data collection.