Zuk, Malgorzata
Migdal, Anna http://orcid.org/0000-0003-4103-500X
Dominczak, Joanna
Brzezinska-Rajszys, Grazyna
Article History
Received: 10 August 2018
Accepted: 23 February 2019
First Online: 4 March 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in study were in accordance with the ethical standards of national research committee and with the 1964 Helsinki Declaration and its later amendments.
: For all procedures informed consent from parents and older children was obtained.