Received: 8 February 2020
Accepted: 27 June 2020
First Online: 8 July 2020
Ethics approval and consent to participate
: The study was approved by the local Bioethics Review Committee (Ref. no KBET/90/B/2011), and an informed written consent to attend the study protocol was granted by all participants.
: Not applicable.
: The authors have no competing interests to disclose.