Ramírez Ramos, A. “A Historical Overview of Gastroenterology and Digestive Endoscopy in Peru: A Tribute for Those Who Shaped These Disciplines”. ACTA MEDICA PERUANA, Vol. 25, no. 2, June 2018, pp. 113-22, http://www.amp.cmp.org.pe/index.php/AMP/article/view/2632.