Lewis SJ, Heaton KW (1997) [32]. «Stool form scale as a useful guide to intestinal transit time». Scand. J. Gastroenterol. (9): 920–4. PMID9299672. doi:10.3109/00365529709011203.
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Lewis SJ, Heaton KW (1997) [32]. «Stool form scale as a useful guide to intestinal transit time». Scand. J. Gastroenterol. (9): 920–4. PMID9299672. doi:10.3109/00365529709011203.