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[2]Asnicar F, Leeming ER, Dimidi E, et al. Blue poo:impact of gut transit time on the gut microbiomeusing a novel marker. Gut.2021

[3]Katherine A.McDonald BScH,Amanda J. ShelleyBScH,Sophia Colantonio MPH, MD,Jennifer BeeckerMD, CCFP(EM),FRCPC, FAAD.Hair pull test:Evidence-based update and revision ofguidelines.Journal of the American Academy ofDermatology.2017