1. ; Division of Medical Genetics, Department of Pediatrics; Stanford University; California
2. ; Division of Medical Genetics, Department of Pediatrics; University of California; San Francisco California
3. ; Section on Human Biochemical Genetics, Heritable Disorders Branch, National Institute of Child Health and Human Development; National Institutes of Health; Maryland USA
4. ; Department of Pathology; Oulu University; Oulu Finland
5. ; Department of Obstetrics and Gynecology; USA
6. ; Department of Pathology; University of California; San Francisco California
7. ; Department of Neurology; Jefferson Medical College; Philadelphia Pennsylvania USA