Levine, Marc S.
Rubesin, Stephen E.
Article History
First Online: 24 June 2017
<!--Emphasis Type='Bold' removed-->Compliance with ethical standards
:
: Dr.’s Levine and Rubesin are both consultants for Bracco Diagnostics, Inc. The authors declare that they have no other conflicts of interest.
: This is a review article and not a study involving procedures on human participants or animals performed by any of the authors.