1. Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
2. Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstrasse 19-21, 50935 Cologne, Germany
3. University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
4. Pathology Queensland, Brisbane, Queensland, Australia
5. Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania