1. Division of Infectious Diseases, Washington University School of Medicine , St. Louis, MO , USA
2. Division of Laboratory Medicine, Sapporo Medical University Hospital , Sapporo , Japan
3. Department of Infection Control and Laboratory Medicine, Sapporo Medical University School of Medicine , Sapporo , Japan
4. Epidemiology, GSK, Collegeville , PA , USA
5. Global Medical Affairs, GSK , Brentford, Middlesex , UK