1. Department of Medicine, University of Nebraska Medical Center, Omaha, NE, USA
2. Department of Pathology and Microbiology and Associate Dean for Medical Education, University of Nebraska Medical Center, Omaha, NE, USA
3. Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, USA
4. Department of Pathology and Microbiology, Omaha, NE, USA
5. Department of Surgery and Graduate Medical Education Research and Education Program Manager, University of Nebraska Medical Center, Omaha, NE, USA