Sayed, A
Šerý, O
Plesnik, J
Daoudi, H
Rouabah, A
Rouabah, L
Khan, N A
Article History
Received: 7 July 2014
Revised: 23 October 2014
Accepted: 2 November 2014
First Online: 17 February 2015
Competing interests
: The authors declare no conflict of interest.