Wuethrich, P. Y.
Burkhard, F. C.
Studer, U. E.
Article History
Received: 11 April 2018
Accepted: 19 April 2018
First Online: 28 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This is a letter to the editor not directly involving human participants or animals.
: Not required.