1. Department of Pediatrics, The University of Iowa Hospitals and Clinics, Iowa City
2. Children's Hospital of Illinois, University of Illinois at Chicago, College of Medicine at Peoria, Department of Pediatrics, Peoria, Illinois
3. Department of Preventive Medicine, The University of Iowa Hospitals and Clinics, Iowa City
4. Department of Radiology, The University of Iowa Hospitals and Clinics, Iowa City