1. Centers for Disease Control and Prevention Atlanta GA USA
2. Department of Family and Community MedicineSchool of Medicine, University of California San Francisco San Francisco CA USA
3. Vanderbilt University Medical Center Nashville TN USA
4. Yale School of Public Health New Haven CT USA
5. Oregon Department of Human Services Portland OR USA
6. University of Rochester School of Medicine and Dentistry Rochester NY USA
7. California Emerging Infections Program Oakland CA USA