Received: 28 June 2019
Accepted: 7 January 2020
First Online: 16 January 2020
Ethics approval and consent to participate
: This study was carried out in concordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans and was approved by the local Ethical Committee of University Hospital Bratislava. The participants signed informed consent. The investigators preserved full anonymity of all participants.
: Not applicable.
: The authors declare that they have no competing interests.