Vlčková, K
Ondrušová, L
Vachtenheim, J
Réda, J
Dundr, P
Zadinová, M
Žáková, P
Poučková, P
Article History
Received: 3 September 2015
Revised: 30 November 2015
Accepted: 1 December 2015
First Online: 14 January 2016
Competing interests
: The authors declare no conflict of interest.