[1] Univ Minnesota, Gamma Knife Ctr, Minneapolis, MN USA
[2] Univ Minnesota, Minneapolis Radiat Oncol, Minneapolis, MN USA
[3] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA
[4] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[5] Univ Minnesota, Med Ctr, Dept Biostat, Minneapolis, MN 55455 USA
[6] Univ Colorado, Denver, CO 80202 USA
[7] Univ Calif San Francisco, San Francisco, CA 94143 USA
[8] Duke Univ, Med Ctr, Durham, NC USA
[9] Massachusetts Gen Hosp, Boston, MA 02114 USA
[10] Univ Maryland, Baltimore, MD 21201 USA
[11] Univ Montreal, CHUM, Montreal, PQ, Canada
[12] Dana Farber Canc Inst, Boston, MA 02115 USA
[13] Yale Med Ctr, New Haven, CT USA
[14] Yale Univ, New Haven, CT USA
[15] Mayo Clin, Rochester, MN USA
[16] Univ Minnesota, Med Ctr, Minneapolis, MN 55455 USA
[17] Duke Univ, Durham, NC USA
[18] Miami Canc Inst, Miami, FL USA