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Article History

First Online: 1 February 2018

Compliance with ethical standards

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: Giuseppe Brancatelli has received lecture fees from Bayer and Guerbet. Alessandro Furlan Book Contract with Elsevier/Amirsys; Research grant from General Electric; Consultant for General Electric. The other authors have no conflict 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. This article does not contain any studies with animals performed by any of the authors.

: For this type of study formal consent is not required.