1. Department of Medicine, Division of Infectious Diseases, Mayo Clinic, Phoenix, Arizona, USA
2. Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
3. Department of Internal Medicine, Mayo Clinic, Phoenix, Arizona, USA
4. Department of Medicine, Division of Hematology and Oncology, Mayo Clinic, Phoenix, Arizona, USA
5. Department of Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, Arizona, USA