[1] BROWN UNIV, ROGER WILLIAMS GEN HOSP, PROVIDENCE, RI 02908 USA
[2] HARVARD UNIV, SCH MED, DANA FARBER CANC INST, DIV BIOSTAT, BOSTON, MA 02115 USA
[3] CUNY MT SINAI SCH MED, NEW YORK, NY 10029 USA
[4] BOSTON UNIV, VET ADM HOSP, BOSTON, MA 02215 USA
[5] THOMAS JEFFERSON UNIV HOSP, PHILADELPHIA, PA 19107 USA
[6] UNIV ROCHESTER, STRONG MEM HOSP, ROCHESTER, NY 14642 USA
[7] UNIV SHERBROOKE, CHU, SHERBROOKE J1K 2R1, QUEBEC, CANADA
[8] MAYO CLIN & MAYO FDN, ROCHESTER, MN 55905 USA
[9] AMER ONCOL HOSP, PHILADELPHIA, PA 19111 USA
[10] TUFTS UNIV, NEW ENGLAND MED CTR HOSP, BOSTON, MA 02111 USA