1. Cambridge Health Alliance, Cambridge, Massachusetts
2. Harvard Medical School, Boston, Massachusetts
3. Division of Preparedness and Emerging Infections, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
4. University of Iowa Carver College of Medicine, Iowa City, Iowa
5. Emerging Infections Network, Iowa City, Iowa
6. Beth Israel Deaconess Medical Center, Boston, Massachusetts
7. Harvard School of Public Health, Boston, Massachusetts