Heiland, Dieter Henrik
Simon-Gabriel, Carl Philipp
Demerath, Theo
Haaker, Gerrit
Pfeifer, Dietmar
Kellner, Elias
Kiselev, Valerij G.
Staszewski, Ori
Urbach, Horst
Weyerbrock, Astrid
Mader, Irina
Article History
Received: 29 July 2016
Accepted: 27 January 2017
First Online: 7 March 2017
Competing interests
: The authors declare no competing financial interests.