1. Medical Department Ross Products Division Abbott Laboratories Columbus Ohio U.S.A.
2. Division of Medical Genetics Department of Pediatrics Emory University School of Medicine Atlanta Georgia U.S.A.
3. Division of Medical Genetics The Children’s Hospital Denver Colorado U.S.A.
4. Division of Medical Genetics The Children’s Hospital Boston Massachusetts U.S.A.
5. Department of Pediatrics University of Washington Seattle Washington U.S.A.
6. Division of Medical Genetics The Children’s Hospital Los Angeles California U.S.A.
7. Division of Medical Genetics Children’s Hospital Pittsburgh Pennsylvania U.S.A.