Documents: 

Beltrán-Aguilar, E.D., Estupiñán-Day, S. Analysis of Prevalence and Trends of Dental Caries in the Americas between the 1970s and 1990s. International Dental Journal. 1999; 49:322-329. /

Estupiñán-Day, S. Promoting Oral Health: The Use of Salt Fluoridation to Prevent Dental Caries, Pan American Health Organization, Scientific and Technical Publication No. 615, Washington, D.C., PAHO, 2005.