Text and Data Mining valid from 2017-08-19
Received: 31 May 2017
Accepted: 26 July 2017
First Online: 19 August 2017
Compliance with ethical standards
: The authors disclose that they did not receive any personal or financial support for this multicenter study.
: Luca Guerra has had honorarium from GE Healthcare for speaking at symposia. All other authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee 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.