Article History
Received: 1 July 2019
Accepted: 23 October 2019
First Online: 7 November 2019
Compliance with ethical standards
:
: Skulec R reports no financial support from GE Medical Systems Ceska republika, s.r.o.; two ultrasound devices, Vscan Dual Probe (GE Healthcare, Chicago, Illinois, USA), were temporarily provided by them for study purposes. Otherwise, he and other authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee (Ethics Committee, University hospital Hradec Kralove, Czech Republic, reference code 201603S-12) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants included in the study.