Funding for this research was provided by:
Ministerstvo Zdravotnictví Ceské Republiky (MH CZ - DRO (Nemocnice Na Homolce - NNH, 00023884), IG150501)
Received: 6 July 2019
Accepted: 21 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The present study was performed in accordance with the principles of the Declaration of Helsinki, and the study protocol was approved by the Institutional Ethics Committee of the Na Homolce Hospital (Prague, Czech Republic). Informed consent was obtained from conscious patients before measurements. In unconscious subjects at the time of measurement, informed consent was obtained retrospectively. In two deceased patients, informed consent was obtained from next of kin.
: Not applicable
: PO received speaker’s fee from Edwards Lifesciences. The other authors declare that they have no competing interests.