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Sources:
https://emedicine.medscape.com/article/184704-medication#4
https://emedicine.medscape.com/article/2172208-overview
https://www.medicinenet.com/laxatives_for_constipation/article.htm#pros_and_precautions_for_using_bulk-forming_laxatives
https://www.mayoclinic.org/diseases-conditions/constipation/in-depth/laxatives/art-20045906
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1704926/
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/fiber/art-20043983
https://www.medscape.com/viewarticle/567681_5
http://onlinelibrary.wiley.com/doi/10.1111/j.1440-1746.2006.04333.x/abstract;jsessionid=F60AE59F43BFDEB34887D08967419B21.f02t01