1. US Military HIV Research Program, Walter Reed Army Institute of Research, 503 Robert Grant Ave, Silver Spring, MD 20910, USA
2. Henry M Jackson Foundation for the Advancement of Military Medicine, 6720A Rockledge Drive, Bethesda, MD 20817, USA
3. Alpha-O Peptides, Lörracherstrasse 50, 4125 Riehen, Switzerland
4. Current address: VRD, Pfizer, 401 N Middletown Rd, Pearl River, NY 10965, USA