1. Department of Medicine, National Jewish Health, Denver, Colorado.
2. Department of Biostatistics and Informatics, Colorado School of Public Health, University of Colorado Denver, Aurora, Colorado.
3. Department of Internal Medicine, Chonnam National University and Hospital, Gwangju, South Korea.
4. Genome Sciences Resource, Vanderbilt University Medical Center, Nashville, Tennessee.
5. Department of Immunology, National Jewish Health, Denver, Colorado.