Affiliation: | 1. Department of Epidemiology and Biostatistics, University of Texas Health Science Center, San Antonio, Texas;2. Division of Hematology/Oncology, University of Texas Health Science Center, San Antonio, Texas;3. Division of Biostatistics, University of California at Davis, Davis, California;4. Division of Hematology and Oncology, University of California at Davis, Davis, California |