1. Department of Pediatrics, University of Iowa, Iowa City, Iowa, and is Postdoctoral Fellow, Program in Genomics, Division of Genetics, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts.
2. Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway, and Craniofacial Research, Musculoskeletal Disorders, Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia.
3. Division of Neonatology, Department of Pediatrics, University of Iowa, Iowa City, Iowa.