Funding for this research was provided by:
Narodowe Centrum Nauki (2014/13/B/NZ5/03102)
Polish Mother’s Memorial Hospital Research Institute, Lodz, Poland (statutory funding)
Received: 18 October 2019
Accepted: 23 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: All patients (or in case of participants under 16 years of age, their parents/guardians) gave informed consent to participate in this study. All research and methods were performed in accordance with relevant regulations as approved by the Bioethics Committee of the Polish Mother’s Memorial Hospital Research Institute (approval number 42/2012). All the procedures followed the Declaration of Helsinki principles.
: All patients (or in case of participants under 16 years of age, their parents/guardians) gave written informed consent for publication.
: The authors declare that they have no competing interests.