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„Country, regional, and global estimates for lactose malabsorption in adults: a systematic review and meta-analysis”. The Lancet. Gastroenterology & Hepatology2 (10): 738–746. October 2017. DOI:10.1016/S2468-1253(17)30154-1. PMID28690131.
„Lactose digestion and the evolutionary genetics of lactase persistence”. Human Genetics124 (6): 579–91. January 2009. DOI:10.1007/s00439-008-0593-6. PMID19034520.