1. Clalit Research Institute, Clalit Health Services, Tel Aviv, Israel
2. Faculty of Social Welfare and Health Sciences, University of Haifa, Haifa, Israel
3. School of Economics, Tel Aviv University, Tel Aviv, Israel
4. Department of Economics, Stanford University, Stanford, CA, USA
5. National Bureau of Economic Research, Cambridge, MA, USA
6. Epidemiology Department, Faculty of Health Sciences, Ben Gurion University, Beersheba, Israel