1. Neil Mehta ( ) is an assistant professor in the Department of Health Management and Policy, School of Public Health, at the University of Michigan, in Ann Arbor.
2. Mikko Myrskylä is director of the Max Planck Institute for Demographic Research, in Rostock, Germany; a research professor at the London School of Economics and Political Science, in the United Kingdom; and professor of social statistics at the University of Helsinki, in Finland.