Collado Yurrita L, San Mauro Martin I, Ciudad-Cabanas MJ et al. (2014) Effectiveness of inulin intake on indicators of chronic constipation; a meta-analysis of controlled randomized clinical trials. Nutr Hosp 30 (2)(1699-5198 (Electronic)): 244–252. http://www.aulamedica.es/nh/pdf/7565.pdf