Funding for this research was provided by:
Received: 31 July 2021
Accepted: 4 September 2021
First Online: 13 September 2021
: The study was approved by the medical ethical review boards of the universities of Ulm and Umea. Written informed consent for participation and publication was obtained in accordance with institutional requirements and the study fulfilled the principles of the Declaration of Helsinki.
: The authors declare no competing interests.