Stehlik, Stepan
Varga, Marian
Ledinsky, Martin
Miliaieva, Daria
Kozak, Halyna
Skakalova, Viera
Mangler, Clemens
Pennycook, Timothy J.
Meyer, Jannik C.
Kromka, Alexander
Rezek, Bohuslav
Article History
Received: 28 July 2016
Accepted: 9 November 2016
First Online: 2 December 2016
Competing interests
: The authors declare no competing financial interests.