Muhammad A. Latif has no conflicts of interest. Christopher R. Bailey is co-founder of Shuriken Medical (unrelated). Clifford R. Weiss reports the following: consultant/grant support from Medtronic (related to this study), Boston Scientific (related to this study). Grant support: Guerbet Healthcare (unrelated), Siemens Healthcare (unrelated). Grant Support: NIH/NIBIB/NIDDK. Medical advisory board of PneumoNix Medical (unrelated); and co-founder of Shuriken Medical and Avasys (unrelated). Vice-Chair of the SIR Foundation. Editorial board of Radiology.