1. ; Children's Hospital Los Angeles, Division of Medical Genetics, Department of Pediatrics, Keck School of Medicine; University of Southern California, and the Department of Radiology; Los Angeles California
2. ; PKU Program #73; Children's Hospital Los Angeles; 4650 Sunset Boulevard Los Angeles CA 90027 USA
3. ; Children's Memorial Medical Center; Chicago Illinois
4. ; Department of Pediatrics; University of Illinois at Chicago; Chicago Illinois
5. San Diego Regional Center; San Diego California
6. ; Division of Medical Genetics; University of Iowa; Iowa City Iowa
7. ; Children's Hospital; University of Texas Medical Branch; Galveston Texas
8. ; Department of Pediatrics; University of Washington School of Medicine; Seattle Washington
9. ; Waisman Center on Mental Retardation and Human Development; University of Wisconsin; Madison Wisconsin USA
10. ; John F. Kennedy Institute, Department of Inherited Metabolic Disease; University of Copenhagen; Glostrup Denmark
11. ; National Institute of Child Health and Human Development; Bethesda Maryland
12. ; Children's Medical Center; Tulsa Oklahoma
13. ; Genetics Division; Children's Hospital; Buffalo New York
14. ; Institute of Genetics; Johns Hopkins Hospital; Baltimore Maryland
15. Developmental Pediatrics; Boca Raton Florida
16. ; Children's Hospital; Denver Colorado USA