139

MedlinePlus: Stools — pale or clay-colored. medlineplus.gov/ency/article/003129.htm.

140

MedlinePlus: Bloody or tarry stools. medlineplus.gov/ency/article/003130.htm.

141

U.S. Preventive Services Task Force: Final Recommendation Statement. Colorectal Cancer. Screening. uspreventiveservicestaskforce.org/Page/Document/RecommendationStatementFinal/colorectal-cancer-screening2.

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