[1] NSIA LUTH Canc Ctr, Lagos, Nigeria
[2] Johns Hopkins Med, Baltimore, MD USA
[3] Univ Massachusetts Lowell, Lowell, MA USA
[4] Thomas Jefferson Dept Radiat Oncol, Philadelphia, PA USA
[5] Radiat Knowledge, Chicago, IL USA
[6] Univ Penn, Philadelphia, PA 19104 USA
[7] UPMC Hillman Canc Ctr, Pittsburgh, PA USA
[8] Johns Hopkins Univ Hosp, Baltimore, MD USA