1. Mount Auburn Hospital Department of Medicine, , Cambridge, MA 02138 , USA
2. Harvard Medical School , Boston, MA 02115 , USA
3. Epidemiology, Biostatistics and Prevention Institute, University of Zurich , Zurich, 8001 , Switzerland
4. University of Texas School of Public Health Division of Epidemiology, Human Genetics & Environmental Sciences, , Houston, TX 77030 , USA
5. University of Veterinary Medicine Research Center Emerging Infections and Zoonoses, , Hannover, 30559 , Germany
6. Spaarne Gasthuis Department of Intensive Care, , Haarlem, 2035 , Netherlands
7. Erasmus Medical Center Department of Intensive Care, , Rotterdam, 3015 , Netherlands
8. Boston University Department of Global Health, , Boston, MA 02118 , USA
9. Massachusetts General Hospital Medical Practice Evaluation Center, , Boston, MA 02114 , USA
10. Massachusetts General Hospital Division of Infectious Diseases, , Boston, 02114 , USA
11. Mount Auburn Hospital Division of Infectious Diseases and Travel Medicine, , Cambridge, MA 02138 , USA