1. Vaccines Medical Development and Scientific and Clinical Affairs, Pfizer, Inc., Collegeville, Pennsylvania
2. Department of Social and Preventive Medicine, Laval University, Quebec City, Canada
3. Vaccines Medical Development and Scientific and Clinical Affairs, Pfizer Canada, Inc., Kirkland, Quebec
4. Boston University Schools of Medicine and Public Health, Massachusetts
5. Boston Medical Center, Massachusetts
6. Vaccines Medical Development and Scientific and Clinical Affairs, Pfizer, Inc., Paris, France
7. Vaccines Medical Development and Scientific and Clinical Affairs, Pfizer, Inc., New York, New York