1. Department of Internal Medicine, Division of Hematology and Oncology, University of Arkansas for Medical Sciences (UAMS), Little Rock, AR, USA
2. Department of Internal Medicine, Division of Neurology, University of Arkansas for Medical Sciences (UAMS), Little Rock, AR, USA
3. Department of Internal Medicine, University of Arkansas for Medical Sciences (UAMS), Little Rock, AR, USA
4. Department of Pathology, University of Arkansas for Medical Sciences (UAMS), Little Rock, AR, USA