1. The Institute for Genomic Research, 9712 Medical Center Dr, Rockville, MD 20850, USA
2. Novartis Vaccines and Diagnostics Ltd, Via Fiorentina 1, 53100 Siena, Italy
3. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia 30322 and Research Service, VA Medical Center, Decatur, GA 30033, USA