Drews, Björn
Deiß, Markus
Jachymski, Krzysztof
Idziaszek, Zbigniew
Hecker Denschlag, Johannes
Article History
Received: 10 June 2016
Accepted: 7 February 2017
First Online: 23 March 2017
Competing interests
: The authors declare no competing financial interests.