Akyüz, Filiz, and Özlem Mutluay Soyer. “How Is Gastroesophageal Reflux Disease Classified?”. Turkish Journal of Gastroenterology 28, no. 1 (January 1, 2017): S10-S11. Accessed January 1, 2026. https://www.turkjgastroenterol.org/index.php/tjg/article/view/2999.