Osman Ersoy, et al. “Evaluation of Serum Ghrelin Levels in Patients With Hyperplastic Gastric Polyps”. Turkish Journal of Gastroenterology, vol. 23, no. 5, July 2019, pp. 444-7, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/2681.