1. Division of Endocrinology University of Iowa Stead Family Children's Hospital Iowa City Iowa USA
2. Department of Pediatrics University of Iowa Iowa City Iowa USA
3. Division of Endocrinology Children's National Hospital Washington District of Columbia USA
4. Department of Pediatrics George Washington School of Medicine and Health Sciences Washington District of Columbia USA
5. Cincinnati Children's Hospital Medical Center Cincinnati Ohio USA
6. Department of Pediatrics University of Cincinnati Cincinnati Ohio USA