Tahbaz Hosseinzadeh, S., S. Poorsaadati, B. Radkani, and M. Forootan. “Psychological Disorders in Patients With Chronic Constipation”. Gastroenterology and Hepatology from Bed to Bench, vol. 4, no. 3, June 2011, doi:10.22037/ghfbb.v4i3.175.