[1] BETH ISRAEL HOSP, DEPT RADIOL, 330 BROOKLINE AVE, BOSTON, MA 02215 USA
[2] SHANDONG MED IMAGING RES INST, JINAN, PEOPLES R CHINA
[3] UNIV HEIDELBERG, KLINIKUM MANNHEIM, D-6800 MANNHEIM 1, FED REP GER
[4] NEW ENGLAND DEACONESS HOSP, BOSTON, MA 02215 USA
[5] MASSACHUSETTS GEN HOSP, DEPT NEUROSURG, BOSTON, MA 02114 USA
[6] MASSACHUSETTS GEN HOSP, DEPT RADIOL, BOSTON, MA 02114 USA