Pınar KOCAAY, et al. “Normal Defecation Pattern, Frequency of Constipation and Factors Related to Constipation in Turkish Children 0-6 Years Old”. Turkish Journal of Gastroenterology, vol. 22, no. 4, July 2019, pp. 369-75, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/2500.