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Combined Psyllium Husk and Lactulose Supplementation Improves Stool Frequency and Gut Microbiota Diversity in Elderly Patients With Chronic Constipation: A Randomized, Double-Blind, Placebo-Controlled Trial. JCNFS 2023, 6 (1), 46-52. https://doi.org/10.5281/zenodo.22337791.