1. Department of Medicine, Internal Medicine Residency Training Program, University of Colorado School of Medicine, Aurora, CO, USA;
2. Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, CO, USA;
3. Department of Pediatrics, Cancer Center Biostatistics Core, University of Colorado School of Medicine, Aurora, CO, USA;
4. Department of Medicine, Division of Hematology, University of Colorado School of Medicine, Aurora, CO, USA