1. Department of Pathology and Laboratory Medicine; University of Rochester Medical Center; Rochester NY USA
2. Department of Pathology, Microbiology, and Immunology; Vanderbilt University Medical Center; Nashville TN USA
3. Immunology and Pathogenesis Branch; Influenza Division; National Center for Immunization and Respiratory Diseases; Centers for Disease Control and Prevention; Atlanta GA USA
4. Department of Pathology, Immunology, and Laboratory Medicine; University of Florida; Gainesville FL USA