Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Arif Musa, MD reports financial support was provided by the Radiological Society of North America Research & Education Foundation. Arif Musa, MD, is also a content contributor to WebMD/Medscape. All other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.