1. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.
2. Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama.
3. Rush Medical College, Chicago, Illinois.
4. Department of Pediatrics for Case, Rainbow Babies & Children's Hospital, Case Western Reserve University/Case Medical Center, Cleveland, Ohio.
5. Departments of Pediatrics and Medicine, Divisions of Infectious Diseases, Medical University of South Carolina, Charleston, South Carolina.
6. Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia.