1. The Pew Charitable Trusts, Washington, District of Columbia, USA
2. American Medical Association, Chicago, Illinois, USA
3. Department of Health Policy and Management, Sol Price School of Public Policy, University of Southern California, Los Angeles, California, USA
4. Division of Infectious Diseases, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
5. Division of General Internal Medicine and Geriatrics, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA