1. GSK, Health Economics and Outcomes Research, Mississauga, Ontario, Canada
2. Department of Mathematics and Statistics, University of Guelph, Guelph, Ontario, Canada
3. Optum, Health Economics and Outcomes Research, San Jose, CA, USA
4. Optum, Health Economics and Outcomes Research, Burlington, Ontario, Canada
5. GSK, Medical Affairs, Mississauga, Ontario, Canada