1. Department of Pediatrics,
2. Department of Medicine,
3. Department of Medicine, University of Vermont Medical Center, Burlington, Vermont; and
4. Center for Genes, Environment, and Health,
5. National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
6. Division of Biostatistics, and
7. Division of Mycobacterial and Respiratory Infections, National Jewish Health, Denver, Colorado;