Received: 19 December 2018
Accepted: 10 October 2019
First Online: 28 October 2019
Ethics approval and consent to participate
: All procedures involving human participants were performed in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Approval by the local ethics review committee - Komisja Bioetyczna Uniwersytetu Jagiellońskiego was obtained (nr 1072.6120.88.2018). As the study was retrospective, no consent to participate from participants was obtained nor required by the local ethics review committee.
: Not applicable
: The authors declare that they have no competing interests.