Sitek, Anna
Ţolea, Mugurel
Niţă, Marian
Serra, Llorenç
Gudmundsson, Vidar
Manolescu, Andrei
Article History
Received: 30 September 2016
Accepted: 2 December 2016
First Online: 10 January 2017
Competing interests
: The authors declare no competing financial interests.