Emanuele Casciani, Gianfranco Gualdi, Department of Emergency Radiology, “La Sapienza” University-Hospital Umberto I, 00166 Rome, Italy
Chiara De Vincentiis, Department of Radiology, “La Sapienza” University-Sant’Andrea’s Hospital, 00189 Rome, Italy
Author contributions: Casciani E designed the study and wrote the manuscript; De Vincentiis C acquired the material, analysed data and helped to write the manuscript; Gualdi GF provided the collection of part of the material.
Conflict-of-interest statement: We have read and understood BPG’s revision policy on declaration of interests and declare that we have no competing interests.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Dr. Emanuele Casciani, Department of Emergency Radiology, “La Sapienza” University-Hospital Umberto I, Viale del Policlinico 155, 00166 Rome, Italy. email@example.com
Telephone: +39-6-49979465 Fax: +39-6-6630218
Received: January 28, 2015
Peer-review started: February 1, 2015
First decision: March 6, 2015
Revised: March 26, 2015
Accepted: May 26, 2015
Article in press: May 27, 2015
Published online: August 28, 2015