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Article History

Received: 27 December 2017

Accepted: 23 January 2018

First Online: 9 April 2018

Compliance with ethical standards

:

: The scientific guarantor of this publication is Raphaele Renard Penna.

: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

: Alexandre Lafourcade and Lisa Belin (Hopital Pitié Salpétrière) kindly provided statistical advice for this manuscript.

: Written informed consent was obtained from all subjects (patients) in this study.

: Institutional Review Board approval was not required because the methodology of the study was retrospective on imaging materials, without any supplementary interventions than routine practice for medical care.

: • retrospective• diagnostic or prognostic study• performed at one institution