[1] SALK INST BIOL STUDIES, DEPT CANC BIOL, SAN DIEGO, CA 92138 USA
[2] UNIV CALIF SAN DIEGO, CTR CANC, CANC BIOL PROGRAM, LA JOLLA, CA 92093 USA
[3] UNIV COLORADO, SCH MED, DEPT MED, DIV HEMATOL, DENVER, CO 80262 USA
[4] UNIV CALIF SAN DIEGO, DIV HEMATOL ONCOL, LA JOLLA, CA 92093 USA
[5] UNIV CALIF SAN DIEGO, DIV LAB MED, LA JOLLA, CA 92093 USA
[6] UNIV COLORADO, SCH MED, DEPT MED, DIV ONCOL, DENVER, CO 80262 USA