1. Institute of Biomedical Technologies, National Research Council, Pisa 56124, Italy.
2. Initiative for Vaccine Research, WHO, Geneva 1211-27, Switzerland.
3. Fondation Mérieux, Lyon 69002, France.
4. Stanford University School of Medicine, Stanford, CA 94305–5166, USA.
5. Institute for Biomedical Aging Research, University of Innsbruck, Innsbruck 6020, Austria.
6. Novartis Vaccines and Diagnostics, Siena 53100, Italy.