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WHO 1960. WHO 1976. WHO 1981. PAHO 1984. Walsh 1984. WHO 1985. WHO 1990. PAHO 1984. Schmunis 1988. World Bank/DCPP 2006. PAHO 2007. millions.
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WHO 1960 WHO 1976 WHO 1981 PAHO 1984 Walsh 1984 WHO 1985 WHO 1990 PAHO 1984 Schmunis 1988 World Bank/DCPP 2006 PAHO 2007 millions