“Anexo 1: Carta Del Dr. Benjamín Viel V”. Cuadernos Médico Sociales 33, no. 2-3 (June 28, 1992): 61–62. Accessed September 13, 2025. https://www.cms.ojstest.com/sitio%20nuevo%20ok/index.php/cms/article/view/1251.