1. Infectious Disease Division, Department of Medicine, SUNY Upstate Medical University, 725 Irving Avenue, Suite 304, Syracuse, NY 13210, USA
2. Department of Virology, Armed Forces Research Institute of Medical Sciences, USAMC-AFRIMS, APO, AP 96546, USA
3. Global Clinical Research and Development, GlaxoSmithKline Biologicals, North America, 2301 Renaissance Boulevard, Mail Code RN0220, King of Prussia, PA 19406-2772, USA