1. Department of Microbiology Icahn School of Medicine at Mount Sinai New York City NY USA
2. Division of Viral Products, Food and Drug Administration Bethesda MD USA
3. Division of Virology National Institute for Biological Standards and Control Potters Bar UK
4. Formerly Influenza Branch Centers for Disease Control and Prevention (CDC) Atlanta GA USA
5. Department of Clinical Science Influenza Centre University of Bergen Bergen Norway