1. Department of Pediatric and Adolescent Medicine
2. Asthma Epidemiology Research Unit
3. Division of Biomedical Statistics and Informatics, and
4. Mayo Medical School, Rochester, Minnesota
5. Division of Neonatology, Children’s Hospitals and Clinics of Minnesota, Minneapolis, Minnesota; and
6. Division of Allergic Diseases, Mayo Clinic, Mayo Clinic, Rochester, Minnesota
7. Department of Medicine Research, Mayo Clinic, Rochester, Minnesota