1. Department of Internal Medicine, Section of Rheumatology, Immunology, and Allergy, University of Oklahoma Health Sciences Center, 1100 N. Lindsay, Oklahoma City, OK 73104, USA
2. Department of Internal Medicine, University of Oklahoma Health Sciences Center, 1100 N. Lindsay, Oklahoma City, OK 73104, USA
3. Department of Pathology and Laboratory Medicine, Oklahoma City VA Health Care System, 921 NE 13th Street, Oklahoma City, OK 73104, USA
4. Department of Pathology and Laboratory Medicine, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA
5. Section of Infectious Diseases, Medical Service, Oklahoma City VA Health Care System, 921 NE 13th Street, Oklahoma City, OK 73104, USA
6. Department of Internal Medicine, Section of Infectious Diseases, University of Oklahoma Health Sciences Center, 1100 N. Lindsay, Oklahoma City, OK 73104, USA