[1] UT Southwestern Med Ctr, Dallas, TX 75390 USA
[2] Massachusetts Gen Hosp, Ctr Image Guided Canc Therapy, Boston, MA 02114 USA
[3] Baton Rouge Gen Hosp, Dept Internal Med, Baton Rouge, LA USA
[4] St Joseph Hosp, Dept Radiol, Chicago, IL USA
[5] Massachusetts Gen Hosp, MGH Canc Ctr, Boston, MA 02114 USA