Voelker, Ricardo, Oscar Balboa, and Ana Lerena. “Preoperative Valoration and Management of the Patient With Esophageal Cancer”. Cirugía del Uruguay 50, no. 6 (March 22, 1980): 538–540. Accessed March 29, 2026. https://replica-revista.scu.org.uy/index.php/cir_urug/article/view/3220.