1. Section of Infectious Disease, Department of Internal Medicine, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut, USA
2. Section of Infectious Disease, Department of Internal Medicine, Yale School of Medicine, New Haven, Connecticut, USA
3. HIV Reference Laboratory, HIV Laboratory Branch, Division of HIV/AIDS Prevention, National Center for HIV, Hepatitis, STD and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Laboratory Medicine, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut, USA
5. Department of Laboratory Medicine, Yale School of Medicine, New Haven, Connecticut, USA