[1] UNIV PENN, FOX CHASE CANC CTR, DEPT RADIAT ONCOL, PHILADELPHIA, PA 19111 USA
[2] MED COLL WISCONSIN, DEPT RADIAT THERAPY, MILWAUKEE, WI 53226 USA
[3] UNIV TEXAS, MD ANDERSON CANC CTR, CTR RADIOL PHYS, DEPT RADIAT PHYS, HOUSTON, TX 77030 USA
[4] MEM SLOAN KETTERING CANC CTR, DEPT RADIAT ONCOL, NEW YORK, NY 10021 USA
[5] SIEMENS MED LABS INC, CONCORD, CA 94520 USA
[6] UNIV FLORIDA, DEPT RADIAT ONCOL, GAINESVILLE, FL 32610 USA
[7] WASHINGTON UNIV, SCH MED, EDWARD MALLINCKRODT INST RADIOL, DIV RADIAT ONCOL, ST LOUIS, MO 63110 USA
[8] SUNY STONY BROOK, UNIV HOSP, CTR HLTH & SCI, DEPT RADIAT ONCOL, STONY BROOK, NY 11794 USA
[9] HARVARD UNIV, SCH MED, DEPT RADIAT THERAPY, BOSTON, MA 02115 USA
[10] HAHNEMANN UNIV, PHILADELPHIA, PA 19102 USA
[11] CENT ARKANSAS RADIAT THERAPY INST, LITTLE ROCK, AR 72215 USA