Funding for this research was provided by:
Narodowe Centrum Nauki (N N403 584038)
Received: 30 September 2019
Accepted: 30 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the Poznan University of Medical Sciences (No 87/09). Informed written consent was obtained from all the patients and controls or their parents/legal guardians in the case of under-aged participants.
: Not applicable.
: The authors declare that they have no competing interests.