[1] Boston Univ, Sch Med, Boston Med Ctr, Dept Radiol, 820 Harrison Ave,3rd Floor, Boston, MA 02118 USA
[2] Boston Univ, Sch Med, Boston Med Ctr, Dept Ophthalmol, 820 Harrison Ave,3rd Floor, Boston, MA 02118 USA
[3] Boston Univ, Sch Med, Boston Med Ctr, Dept Otolaryngol Head & Neck Surg, 820 Harrison Ave,3rd Floor, Boston, MA 02118 USA
[4] Boston Univ, Sch Med, Boston Med Ctr, Dept Radiat Oncol, 820 Harrison Ave,3rd Floor, Boston, MA 02118 USA
[5] Beth Israel Deaconess Med Ctr, Dept Radiol, 330 Brookline Ave, Boston, MA 02215 USA
[6] Vet Adm Boston Healthcare Syst, Dept Radiol, Boston, MA USA
[7] Jichi Med Univ, Sch Med, Dept Radiol, Shimotsuke, Tochigi, Japan