1. Department of Pathology and Laboratory Medicine, UNC-Chapel Hill School of Medicine , Chapel Hill, North Carolina, USA
2. Duke Human Vaccine Institute, Duke University Medical Center , Durham, North Carolina, USA
3. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention , Atlanta, Georgia, USA
4. Clinical Reference Laboratory, Clinical Reference Laboratory Inc. , Lenexa, Kansas, USA
5. Avioq, Inc. , Research Triangle Park, North Carolina, USA