By: Editorial Staff PRESIDENTS OF THREE Central American countries have officially endorsed the Declaration of Chapultepec, a document affirming freedom of expression sponsored by the Inter American Press Association. Presidents Armando Calderon of El Salvador, Carlos Reina of Honduras and Violeta Barrios de Chamorro of Nicaragua signed the manifesto in ceremonies at their respective government houses during visits by an IAPA delegation. The delegation was composed of members of the association from North America and Latin America and was headed by Eduardo Ulibarri, editor of the Costa Rica's La Nacion and chairman of IAPA's freedom of the press and information committee. The leaders endorsed the document-which undersocres the importance of free expression in a democracy-at a time of consolidation for the democratic movements in the region. "I wish to vow before God, before leaders of the IAPA and before the journalists of Nicaragua my support and my government's support for all those who hold the idea that man and peoples were born to live in freedom,"" said Barrios de Chamorro. The declaration has already been signed by the presidents of Argentina, Bolivia, Guatemala, Mexico, Panama, Paraguay and Uruguay.