Bernstein, C., H. Bernstein, C. M. Payne, and H. Garewal. “Field Defects in Progression to Adenocarcinoma of the Colon and Esophagus”. Electronic Journal of Biotechnology, vol. 3, no. 3, Dec. 2000, pp. 0-0, https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v3n3-1.