Received: 8 October 2020
Accepted: 7 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: All participants gave informed written consent prior blood donating. The study was approved by Ethics Committee of the Pomeranian Medical University in Szczecin, Poland (decision No. BN-001/174/05).
: Not applicable.
: The authors declare that they have no competing interests.