1 Department of Radiology, University of North Carolina School of Medicine, Chapel Hill, North Carolina. Electronic address: sheryl_jordan@med.unc.edu.
2 University of Colorado, Aurora, Colorado.
3 University of Massachusetts Medical School-Baystate, Springfield, Massachusetts.
4 Donald and Barbara Zucker School of Medicine at Hofstra/Northwell and the Albert Einstein College of Medicine, Hempstead, New York.
5 Geisel School of Medicine, Dartmouth University, Hanover, New Hampshire.