1. Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
2. Laboratory of Viral Diseases, Wadsworth Center, New York State Department of Health, Albany, New York, USA
3. University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
4. Department of Pathology, Keck School of Medicine of USC, Los Angeles, California, USA
5. American Society for Microbiology, Washington, DC, USA
6. University of North Carolina School of Medicine, Department of Pathology and Laboratory Medicine, Chapel Hill, North Carolina, USA