1. Centers for Disease Control and Prevention, Atlanta, Georgia, USAIllinois Department of Public Health, Chicago, Illinois, USA
2. Kane County Health Department, Aurora, Illinois, USA
3. California Department of Health Services, Richmond, California, USA
4. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. University of Illinois, Chicago, School of Public Health, Chicago, Illinois, USA
6. Illinois Department of Public Health, Chicago, Illinois, USA