Funding for this research was provided by:
British Heart Foundation (NH/16/2/32499)
Ministerstvo Zdravotnictví Ceské Republiky (NV19-02-00197)
Received: 1 October 2020
Accepted: 8 December 2020
First Online: 14 December 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the University Hospital Brno. The parents or legal guardians of all participants gave informed written consent according to the Helsinki declaration.
: The Informed consent provided by the parents or legal guardians of all participants included the agreement of scientific use of the data obtained. No data are presented that would allow individual study participants to be identified.
: The authors declare that they have no competing interests.