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Contributors All authors reviewed and contributed to the text. CL: Literature search, drafting of the initial version of the article. KPSN: idea, review of literature, drafting of the text and editing. CAJR: literature review,writing of radiological aspect and slection and editing of the figures. FWF: reviewed and contributed to the text. RL: reviewed and contributed to the text.
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed. This paper was reviewed by Aaron Berkowitz, Boston, USA.