Received: 31 March 2020
Accepted: 22 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: This analysis was approved by the Northwest and Central Switzerland Ethics Committee (EKNZ 2018–00621) and conducted in accordance with institutional guidelines and the principles of the Declaration of Helsinki and its subsequent amendments [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.