1. US Health Outcomes and Epidemiology—Vaccines, GSK , Philadelphia, PA, USA
2. Health Economics and Outcomes Research, Analysis Group, Inc ., Montreal, Quebec, Canada
3. Health Economics and Outcomes Research, Analysis Group, Inc ., Menlo Park, CA, USA
4. Health Economics and Outcomes Research, Analysis Group, Inc ., Boston, MA, USA
5. Tufts Medical Center , Boston, MA, USA
6. Medical Affairs, GSK , Philadelphia, PA, USA
7. Health Economics and Outcomes Research, Analysis Group, Inc ., New York, NY, USA
8. Division of Gastroenterology and Hepatology, Mayo Clinic , Jacksonville, FL, USA