Racko, Girts
Article History
Received: 5 August 2016
Accepted: 9 January 2017
First Online: 19 January 2017
Compliance with Ethical Standards
:
: All research procedures in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.