08.01.2014
Na podstawie: American Gastroenterological Association, A.E. Bharucha, S.D. Dorn, A. Lembo, A. Pressman: American Gastroenterological Association medical position statement on constipation. A.E. Bharucha, J.H. Pemberton, G.R. Locke: American Gastroenterological Association technical review on constipation.
Gastroenterology, 2013; 144: 211–217, 218–238