1. Comparative Outcomes Group, Bristol, UK
2. Pfizer, Inc., New York, NY 10017, USA
3. OPEN Health, Bethesda, MD 20814, USA
4. OPEN Health, Boston, MA 02142, USA
5. Patient Health & Impact (PHI), Pfizer, Inc., New York, NY 10017, USA
6. Institute for Social & Economic Research & Policy, Columbia University, New York, NY 10027, USA