1. Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Department of Pediatrics, Washington University School of Medicine, Laboratory Services, St Louis Children’s Hospital, St Louis, Missouri
3. Quest Diagnostics Nichols Institute and Children’s National Hospital, Chantilly, Virginia
4. Department of Pathology and Laboratory Medicine, Nationwide Children’s Hospital, Columbus, Ohio
5. Division of Pediatric Endocrinology, Indiana University School of Medicine, Indianapolis
6. Riley Hospital for Children at IU Health, Indianapolis, Indiana
7. Department of Pathology and Laboratory Medicine, University of Kentucky Medical Center, Lexington
8. Department of Pathology, University of Texas Southwestern Medical Center and Children's Medical Center, Dallas
9. National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland
10. Division of Endocrinology, Department of Pediatrics, Children’s Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania