Racko, Girts
Article History
Received: 4 April 2017
Accepted: 30 October 2017
First Online: 10 November 2017
Compliance with Ethical Standards
:
: Girts Racko declares that he has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.