“The importance of stakeholder perception in understanding impact: The Basic Integrated Health System (sibasi) program and quality of primary healthcare in El Salvador”, Rev. Ger. Pol. Sal, vol. 6, no. 12, Jun. 2007, Accessed: May 19, 2025. [Online]. Available: https://revistas.javeriana.edu.co/index.php/gerepolsal/article/view/2697