1. University of Kansas School of Medicine-Wichita, Department of Internal Medicine , Wichita, KS , USA
2. The University of Oklahoma College of Medicine, Department of Internal Medicine, Division of Hematology/Oncology; Stephenson Cancer Center , Oklahoma City, OK , USA
3. Vanderbilt University Medical Center, Department of Medicine, Division of Hematology/Oncology , Nashville, TN , USA
4. The University of Oklahoma College of Medicine, Department of Internal Medicine, Division of Hematology/Oncology; Stephenson Cancer Center , Oklahoma City, Oklahoma , USA
5. Vanderbilt University Medical Center, Department of Medicine, Division of Hematology/Oncology , Nashville, Tennessee , USA
6. Kansas University Cancer Center, Department of Medicine, Division of Medical Oncology , Kansas City, KS , USA