[1] Mt Sinai Sch Med, Dept Med, New York, NY USA
[2] Univ Calif Los Angeles, Ctr Oncol, Los Angeles, CA USA
[3] Oncol Associates S Texas, San Antonio, TX USA
[4] S Carolina Oncol Associates, Dept Med Oncol, Columbia, SC USA
[5] Cleveland Clin Fdn, Dept Hematol & Med Oncol, Cleveland, OH USA
[6] Amgen Inc, Thousand Oaks, CA 91320 USA