Öncü, K., ÖZEL, A. M., Demirtürk, L., GÜRBÜZ, A. K., Yazgan, Y., & KIZILKAYA, E. (2010). Determination of the frequency of dyssynergic defecation and patient characteristics in patients with functional constipation. Turkish Journal of Gastroenterology, 21(4), 372–380. https://doi.org/10.4318/tjg.2010.0123