1. Departments of Health Management and Policy, Economics, and Preventive & Community Dentistry, and Public Policy Center, University of Iowa, Iowa City, IA, USA
2. National Bureau of Economic Research, Cambridge, MA, USA
3. Center of Medical Education and Clinical Investigation/Centro de Educación Médica e Investigación Clínica (CEMIC), Buenos Aires, Argentina
4. Department of Health Management and Policy, University of Iowa, Iowa City, IA, USA
5. Latin American Collaborative Study of Congenital Anomalies/Estudio Colaborativo Latinoamericano de Malformaciones Congénitas (ECLAMC), Buenos Aires, Argentina