Funding for this research was provided by:
Śląski Uniwersytet Medyczny (KNW2/135/06)
Received: 22 August 2020
Accepted: 20 December 2020
First Online: 6 January 2021
Change Date: 15 February 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S12872-021-01912-Y
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Medical University of Silesia—reference number NN-2-345/08 and KNW-1-146/P/1/0. Informed written consent was obtained from each subject.
: Not applicable.
: The authors declare that they have no competing interests.