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Those who undergo GI surgery, like removal of intestines or gastric bypass, may also have difficulty with B12 absorption (4, 5)

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10.1136/gut.2006.101634 Gut 19 MalfertheinerP.MegraudF.OMorainC.GisbertJ.KuipersE.AxonA.et al (2017)

Acknowledgments We would like to thank Clara Marin Briggiler for her insightful comments, and Nria Correa Maas for her contribution with statistical analyses