1. Influenza Division, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
2. Department of Immunobiology, BIO5 Institute, Valley Fever Center for Excellence, and Asthma and Airway Disease Research Center, University of Arizona , Tucson, Arizona , USA
3. Marshfield Clinic Research Institute , Marshfield, Wisconsin , USA
4. University of Michigan School of Public Health , Ann Arbor, Michigan , USA
5. University of Pittsburgh, Schools of Health Sciences , Pittsburgh, Pennsylvania , USA
6. Kaiser Permanente Washington Health Research Institute , Seattle, Washington , USA
7. Baylor Scott & White Health , Temple, Texas , USA
8. Texas A&M University University College of Medicine , Temple, Texas , USA