YILDIRIM, Sadık, et al. “Comparison of Lansoprazole and Omeprazole Treatment in Grade II and III Reflux Esophagitis”. Turkish Journal of Gastroenterology, vol. 12, no. 2, Jan. 2001, pp. 117-21, https://www.turkjgastroenterol.org/index.php/tjg/article/view/1131.