1. Yuting Zhang ( ) is an associate professor of health economics and director of the Pharmaceutical Economics Research Group, both in the Department of Health Policy and Management, at the University of Pittsburgh, in Pennsylvania. She is serving as an unpaid consulting adviser to the Centers for Medicare and Medicaid Services, from December 2014 through November 2015.
2. Seo Hyon Baik is a statistician in the Pharmaceutical Economics Research Group, Department of Health Policy and Management, University of Pittsburgh.
3. Joseph P. Newhouse is the John D. MacArthur Professor of Health Policy and Management, Division of Health Policy Research and Education, at Harvard University, in Cambridge, Massachusetts.