Merkel, Aurélien http://orcid.org/0000-0003-2812-231X
Christensen, Johan http://orcid.org/0000-0002-1604-250X
Article History
Received: 19 July 2019
Accepted: 15 November 2019
First Online: 6 December 2019
Competing interests
: The authors declare no competing interests.