Knight, Sean
Hofmann, Tino
Bouhafs, Chamseddine
Armakavicius, Nerijus
Kühne, Philipp
Stanishev, Vallery
Ivanov, Ivan G.
Yakimova, Rositsa
Wimer, Shawn
Schubert, Mathias
Darakchieva, Vanya
Article History
Received: 3 February 2017
Accepted: 30 May 2017
First Online: 11 July 2017
Competing Interests
: The authors declare that they have no competing interests.