1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
2. Johns Hopkins Medical Institutions, Baltimore, Maryland, USA;
3. University of Arkansas for Medical Sciences College of Medicine, Little Rock, Arkansas, USA;
4. Saint Louis University School of Medicine, Saint Louis, Missouri, USA;
5. Michigan Department of Community Health, Lansing, Michigan, USA;
6. National Institutes of Health, Bethesda, Maryland, USA;
7. Oklahoma State Department of Health, Oklahoma City, Oklahoma, USA;
8. Washington State Department of Health, Shoreline, Washington, USA