Received: 18 April 2019
Accepted: 28 August 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: This study protocol was approved by the Cantonal Ethics Committee of Zürich, Switzerland (Approval Number: 2016-00064) and the need for informed consent was waived.
: Not applicable.
: The authors of this manuscript declare relationships with the following companies: the corresponding author (MM) has received honoraria from GE Healthcare for giving lectures and for moderating workshops.