[1] Seoul Natl Univ, Coll Med, Dept Radiol, Seoul 110744, South Korea
[2] Univ Bologna, Dept Clin Med, Unit Med Symptomatol, Bologna, Italy
[3] Univ Paris 07, Dept Radiol, Beaujon Hosp, Assistance Publ Hopitaux Paris, Paris, France
[4] Tufts Univ, Lahey Clin Med Ctr, Sch Med, Burlington, MA USA