Szumski, Grzegorz
Smogorzewska, Joanna
Grygiel, Paweł
Orlando, Ann-Marie
Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (MNiSW/2015/DIR/20/ACK)
Article History
First Online: 20 November 2017
Compliance with Ethical Standards
:
: The authors declare that they have 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 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all parents of individual participants included in the study.