1. Department of Health Policy and Management, University of Pittsburgh Graduate School of Public Health, USA, and Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA (MR)
2. Institute for Health and Department of Economics, Rutgers University, New Brunswick, NJ, USA (LBR)
3. Yale University, New Haven, CT, USA (ADP)
4. GlaxoSmithKline, Uxbridge, UK (MC)
5. Health Economics & Outcomes Research Ltd., Monmouth, UK (PM)