Funding for this research was provided by:
Maria Grzegorzewska University, Poland (BSTP 37/14-I)
First Online: 29 July 2017
Compliance with Ethical Standards
: 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.
: Anna Zajenkowska declares that she has no conflict of interest.Dorota Jasielska declares that she has no conflict of interest.Justyna Melonowska declares that she has no conflict of interest.