Zubor, Pavol
Gondova, Alexandra
Polivka, Jiri Jr
Kasajova, Petra
Konieczka, Katarzyna
Danko, Jan
Golubnitschaja, Olga
Article History
Received: 7 March 2017
Accepted: 14 March 2017
First Online: 10 April 2017
Compliance with ethical standards
: All procedures performed in the current study 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.
: This multicentred study has been supported by the following organisations:UnorderedList removed
: The authors declare that they have no competing interests.