Ozola-Zālīte, Imanta
Mark, Esben Bolvig
Gudauskas, Tomas
Lyadov, Vladimir
Olesen, Søren Schou
Drewes, Asbjørn Mohr
Pukitis, Aldis
Frokjær, Jens Brøndum
Article History
Received: 21 June 2017
Revised: 8 November 2017
Accepted: 12 January 2018
First Online: 16 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.