1. School of Public Health University of Michigan Ann Arbor Michigan USA
2. Economics Department Indiana University–Purdue University Indianapolis (IUPUI) Indianapolis Indiana USA
3. Economics Department University of North Carolina at Greensboro Greensboro North Carolina USA
4. School of Public Health Indiana University Bloomington Indiana USA
5. O'Neill School of Public and Environmental Affairs Indiana University Bloomington Indiana USA
6. National Bureau of Economic Research Cambridge Massachusetts USA