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