Funding for this research was provided by:
Medical University of Lodz (503/6-029-07/503-61-002-18)
Received: 2 September 2019
Accepted: 21 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: The research project was granted an approval of the Bioethics Committee of the Medical University of Lodz on 22 May 2012 No. RNN/422/12/KB.
: Not applicable.
: The authors declare that they have no competing interests.