Strods, Arnis
Ose, Velta
Bogans, Janis
Cielens, Indulis
Kalnins, Gints
Radovica, Ilze
Kazaks, Andris
Pumpens, Paul
Renhofa, Regina
Article History
Received: 8 February 2015
Accepted: 13 May 2015
First Online: 26 June 2015
Competing interests
: The authors declare no competing financial interests.