1. Departments of Pediatrics (M.P., E.G., R.C., A.K., A.S., T.H., L.S., M.S., M.D.B., M.H., D.B.W.), Washington University and St. Louis Children's Hospital, St. Louis, Missouri 63110
2. Washington University and St. Louis Children's Hospital, St. Louis, Missouri 63110
3. Children's Hospital (M.P., A.K., A.S., M.H.), 00290 Helsinki, Finland
4. Hochschule Mannheim-University of Applied Sciences (E.G., T.H.), 68163 Mannheim, Germany
5. University of Helsinki, 00290 Helsinki, Finland; and Hochschule Mannheim-University of Applied Sciences (E.G., T.H.), 68163 Mannheim, Germany
6. Obstetrics and Gynecology (E.L.S.), Washington University and St. Louis Children's Hospital, St. Louis, Missouri 63110
7. Developmental Biology (D.B.W.), Washington University and St. Louis Children's Hospital, St. Louis, Missouri 63110