1. Department of Microbiology, University of Hawaii, Honolulu, Hawaii
2. Research Institute for Tropical Medicine and Philippine General Hospital, University of the Philippines, Manila, Republic of the Philippines
3. Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
4. National Institute of Public Health and the Environment, Bilthoven, The Netherlands