[1] Univ Penn, Perelman Sch Med, Dept Radiol, 452 BRB 2-3,421 Curie Blvd, Philadelphia, PA 19104 USA
[2] Univ Penn, Perelman Sch Med, Dept Canc Biol, 452 BRB 2-3,421 Curie Blvd, Philadelphia, PA 19104 USA
[3] Hosp Univ Penn, Penn Image Guided Intervent Lab, 3400 Spruce St, Philadelphia, PA 19104 USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Radiol, Houston, TX 77030 USA