1. Department of Pathology, University of Arizona, Tucson, Arizona, USA.
2. Department of Pathology, Stellenbosch University, Cape Town, South Africa.
3. Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, District of Columbia, USA.
4. Department of Medicine and Baylor College of Medicine, Houston, Texas, USA.
5. Department of Pathology, Baylor College of Medicine, Houston, Texas, USA.
6. Department of Laboratory Medicine, University of California, San Francisco, California, USA.
7. Department of Pathology, Mayo Clinic, Scottsdale, Arizona, USA.