[1] BETH ISRAEL HOSP, DEPT PATHOL, BOSTON, MA 02215 USA
[2] SIDNEY FARBER CANC RES CTR, DEPT PATHOL, BOSTON, MA 02215 USA
[3] HARVARD UNIV, SCH MED, DEPT PATHOL, BOSTON, MA 02115 USA
[4] JOHNS HOPKINS UNIV, SCH MED, DEPT PATHOL, BALTIMORE, MD 21205 USA