Vincent Mor is the Florence Price Grant Professor of Community Health in the School of Public Health, Department of Health Policy and Practice at the Brown University School of Public Health. His research focuses on the organizational and health care delivery system factors associated with variation in use of health services, and outcomes experienced by frail and chronically ill persons. Tiziana Leone is a lecturer in demography in the Department of Social Policy at the London School of Economics and Political Science. Dr Leone's research interests focus on demography and health policy. She is particularly interested in reproductive and health systems in developing countries as well as health and ageing in Europe. Anna Maresso is a Research Officer at LSE Health and the European Observatory on Health Systems and Policies. Her research focuses on the health care systems of Western Europe and comparative health policy.