Lorenz, R.
Article History
Received: 29 October 2017
Accepted: 20 January 2018
First Online: 1 February 2018
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: This comment did not need approval from an ethic committee.
: This comment does not contain any studies with participants or animals.
: Informed consent was not required for this comment.